linux/drivers/pinctrl/core.c
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   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 */
  40struct pinctrl_maps {
  41        struct list_head node;
  42        struct pinctrl_map const *maps;
  43        unsigned num_maps;
  44};
  45
  46static bool pinctrl_dummy_state;
  47
  48/* Mutex taken by all entry points */
  49DEFINE_MUTEX(pinctrl_mutex);
  50
  51/* Global list of pin control devices (struct pinctrl_dev) */
  52LIST_HEAD(pinctrldev_list);
  53
  54/* List of pin controller handles (struct pinctrl) */
  55static LIST_HEAD(pinctrl_list);
  56
  57/* List of pinctrl maps (struct pinctrl_maps) */
  58static 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 */
  74void pinctrl_provide_dummies(void)
  75{
  76        pinctrl_dummy_state = true;
  77}
  78
  79const 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}
  84EXPORT_SYMBOL_GPL(pinctrl_dev_get_name);
  85
  86void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev)
  87{
  88        return pctldev->driver_data;
  89}
  90EXPORT_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 */
  99struct 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 */
 123int 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 */
 148const 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 */
 170bool 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}
 183EXPORT_SYMBOL_GPL(pin_is_valid);
 184
 185/* Deletes a range of pin descriptors */
 186static 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
 207static 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
 246static 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 */
 271static struct pinctrl_gpio_range *
 272pinctrl_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 */
 299static 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 */
 328void 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}
 335EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
 336
 337void 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}
 346EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges);
 347
 348/**
 349 * pinctrl_get_group_selector() - returns the group selector for a group
 350 * @pctldev: the pin controller handling the group
 351 * @pin_group: the pin group to look up
 352 */
 353int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
 354                               const char *pin_group)
 355{
 356        const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 357        unsigned ngroups = pctlops->get_groups_count(pctldev);
 358        unsigned group_selector = 0;
 359
 360        while (group_selector < ngroups) {
 361                const char *gname = pctlops->get_group_name(pctldev,
 362                                                            group_selector);
 363                if (!strcmp(gname, pin_group)) {
 364                        dev_dbg(pctldev->dev,
 365                                "found group selector %u for %s\n",
 366                                group_selector,
 367                                pin_group);
 368                        return group_selector;
 369                }
 370
 371                group_selector++;
 372        }
 373
 374        dev_err(pctldev->dev, "does not have pin group %s\n",
 375                pin_group);
 376
 377        return -EINVAL;
 378}
 379
 380/**
 381 * pinctrl_request_gpio() - request a single pin to be used in as GPIO
 382 * @gpio: the GPIO pin number from the GPIO subsystem number space
 383 *
 384 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
 385 * as part of their gpio_request() semantics, platforms and individual drivers
 386 * shall *NOT* request GPIO pins to be muxed in.
 387 */
 388int pinctrl_request_gpio(unsigned gpio)
 389{
 390        struct pinctrl_dev *pctldev;
 391        struct pinctrl_gpio_range *range;
 392        int ret;
 393        int pin;
 394
 395        mutex_lock(&pinctrl_mutex);
 396
 397        ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
 398        if (ret) {
 399                mutex_unlock(&pinctrl_mutex);
 400                return ret;
 401        }
 402
 403        /* Convert to the pin controllers number space */
 404        pin = gpio - range->base + range->pin_base;
 405
 406        ret = pinmux_request_gpio(pctldev, range, pin, gpio);
 407
 408        mutex_unlock(&pinctrl_mutex);
 409        return ret;
 410}
 411EXPORT_SYMBOL_GPL(pinctrl_request_gpio);
 412
 413/**
 414 * pinctrl_free_gpio() - free control on a single pin, currently used as GPIO
 415 * @gpio: the GPIO pin number from the GPIO subsystem number space
 416 *
 417 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
 418 * as part of their gpio_free() semantics, platforms and individual drivers
 419 * shall *NOT* request GPIO pins to be muxed out.
 420 */
 421void pinctrl_free_gpio(unsigned gpio)
 422{
 423        struct pinctrl_dev *pctldev;
 424        struct pinctrl_gpio_range *range;
 425        int ret;
 426        int pin;
 427
 428        mutex_lock(&pinctrl_mutex);
 429
 430        ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
 431        if (ret) {
 432                mutex_unlock(&pinctrl_mutex);
 433                return;
 434        }
 435
 436        /* Convert to the pin controllers number space */
 437        pin = gpio - range->base + range->pin_base;
 438
 439        pinmux_free_gpio(pctldev, pin, range);
 440
 441        mutex_unlock(&pinctrl_mutex);
 442}
 443EXPORT_SYMBOL_GPL(pinctrl_free_gpio);
 444
 445static int pinctrl_gpio_direction(unsigned gpio, bool input)
 446{
 447        struct pinctrl_dev *pctldev;
 448        struct pinctrl_gpio_range *range;
 449        int ret;
 450        int pin;
 451
 452        ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
 453        if (ret)
 454                return ret;
 455
 456        /* Convert to the pin controllers number space */
 457        pin = gpio - range->base + range->pin_base;
 458
 459        return pinmux_gpio_direction(pctldev, range, pin, input);
 460}
 461
 462/**
 463 * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode
 464 * @gpio: the GPIO pin number from the GPIO subsystem number space
 465 *
 466 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
 467 * as part of their gpio_direction_input() semantics, platforms and individual
 468 * drivers shall *NOT* touch pin control GPIO calls.
 469 */
 470int pinctrl_gpio_direction_input(unsigned gpio)
 471{
 472        int ret;
 473        mutex_lock(&pinctrl_mutex);
 474        ret = pinctrl_gpio_direction(gpio, true);
 475        mutex_unlock(&pinctrl_mutex);
 476        return ret;
 477}
 478EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
 479
 480/**
 481 * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode
 482 * @gpio: the GPIO pin number from the GPIO subsystem number space
 483 *
 484 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
 485 * as part of their gpio_direction_output() semantics, platforms and individual
 486 * drivers shall *NOT* touch pin control GPIO calls.
 487 */
 488int pinctrl_gpio_direction_output(unsigned gpio)
 489{
 490        int ret;
 491        mutex_lock(&pinctrl_mutex);
 492        ret = pinctrl_gpio_direction(gpio, false);
 493        mutex_unlock(&pinctrl_mutex);
 494        return ret;
 495}
 496EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
 497
 498static struct pinctrl_state *find_state(struct pinctrl *p,
 499                                        const char *name)
 500{
 501        struct pinctrl_state *state;
 502
 503        list_for_each_entry(state, &p->states, node)
 504                if (!strcmp(state->name, name))
 505                        return state;
 506
 507        return NULL;
 508}
 509
 510static struct pinctrl_state *create_state(struct pinctrl *p,
 511                                          const char *name)
 512{
 513        struct pinctrl_state *state;
 514
 515        state = kzalloc(sizeof(*state), GFP_KERNEL);
 516        if (state == NULL) {
 517                dev_err(p->dev,
 518                        "failed to alloc struct pinctrl_state\n");
 519                return ERR_PTR(-ENOMEM);
 520        }
 521
 522        state->name = name;
 523        INIT_LIST_HEAD(&state->settings);
 524
 525        list_add_tail(&state->node, &p->states);
 526
 527        return state;
 528}
 529
 530static int add_setting(struct pinctrl *p, struct pinctrl_map const *map)
 531{
 532        struct pinctrl_state *state;
 533        struct pinctrl_setting *setting;
 534        int ret;
 535
 536        state = find_state(p, map->name);
 537        if (!state)
 538                state = create_state(p, map->name);
 539        if (IS_ERR(state))
 540                return PTR_ERR(state);
 541
 542        if (map->type == PIN_MAP_TYPE_DUMMY_STATE)
 543                return 0;
 544
 545        setting = kzalloc(sizeof(*setting), GFP_KERNEL);
 546        if (setting == NULL) {
 547                dev_err(p->dev,
 548                        "failed to alloc struct pinctrl_setting\n");
 549                return -ENOMEM;
 550        }
 551
 552        setting->type = map->type;
 553
 554        setting->pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
 555        if (setting->pctldev == NULL) {
 556                dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe",
 557                        map->ctrl_dev_name);
 558                kfree(setting);
 559                /*
 560                 * OK let us guess that the driver is not there yet, and
 561                 * let's defer obtaining this pinctrl handle to later...
 562                 */
 563                return -EPROBE_DEFER;
 564        }
 565
 566        switch (map->type) {
 567        case PIN_MAP_TYPE_MUX_GROUP:
 568                ret = pinmux_map_to_setting(map, setting);
 569                break;
 570        case PIN_MAP_TYPE_CONFIGS_PIN:
 571        case PIN_MAP_TYPE_CONFIGS_GROUP:
 572                ret = pinconf_map_to_setting(map, setting);
 573                break;
 574        default:
 575                ret = -EINVAL;
 576                break;
 577        }
 578        if (ret < 0) {
 579                kfree(setting);
 580                return ret;
 581        }
 582
 583        list_add_tail(&setting->node, &state->settings);
 584
 585        return 0;
 586}
 587
 588static struct pinctrl *find_pinctrl(struct device *dev)
 589{
 590        struct pinctrl *p;
 591
 592        list_for_each_entry(p, &pinctrl_list, node)
 593                if (p->dev == dev)
 594                        return p;
 595
 596        return NULL;
 597}
 598
 599static void pinctrl_put_locked(struct pinctrl *p, bool inlist);
 600
 601static struct pinctrl *create_pinctrl(struct device *dev)
 602{
 603        struct pinctrl *p;
 604        const char *devname;
 605        struct pinctrl_maps *maps_node;
 606        int i;
 607        struct pinctrl_map const *map;
 608        int ret;
 609
 610        /*
 611         * create the state cookie holder struct pinctrl for each
 612         * mapping, this is what consumers will get when requesting
 613         * a pin control handle with pinctrl_get()
 614         */
 615        p = kzalloc(sizeof(*p), GFP_KERNEL);
 616        if (p == NULL) {
 617                dev_err(dev, "failed to alloc struct pinctrl\n");
 618                return ERR_PTR(-ENOMEM);
 619        }
 620        p->dev = dev;
 621        INIT_LIST_HEAD(&p->states);
 622        INIT_LIST_HEAD(&p->dt_maps);
 623
 624        ret = pinctrl_dt_to_map(p);
 625        if (ret < 0) {
 626                kfree(p);
 627                return ERR_PTR(ret);
 628        }
 629
 630        devname = dev_name(dev);
 631
 632        /* Iterate over the pin control maps to locate the right ones */
 633        for_each_maps(maps_node, i, map) {
 634                /* Map must be for this device */
 635                if (strcmp(map->dev_name, devname))
 636                        continue;
 637
 638                ret = add_setting(p, map);
 639                if (ret < 0) {
 640                        pinctrl_put_locked(p, false);
 641                        return ERR_PTR(ret);
 642                }
 643        }
 644
 645        /* Add the pinmux to the global list */
 646        list_add_tail(&p->node, &pinctrl_list);
 647
 648        return p;
 649}
 650
 651static struct pinctrl *pinctrl_get_locked(struct device *dev)
 652{
 653        struct pinctrl *p;
 654
 655        if (WARN_ON(!dev))
 656                return ERR_PTR(-EINVAL);
 657
 658        p = find_pinctrl(dev);
 659        if (p != NULL)
 660                return ERR_PTR(-EBUSY);
 661
 662        return create_pinctrl(dev);
 663}
 664
 665/**
 666 * pinctrl_get() - retrieves the pinctrl handle for a device
 667 * @dev: the device to obtain the handle for
 668 */
 669struct pinctrl *pinctrl_get(struct device *dev)
 670{
 671        struct pinctrl *p;
 672
 673        mutex_lock(&pinctrl_mutex);
 674        p = pinctrl_get_locked(dev);
 675        mutex_unlock(&pinctrl_mutex);
 676
 677        return p;
 678}
 679EXPORT_SYMBOL_GPL(pinctrl_get);
 680
 681static void pinctrl_put_locked(struct pinctrl *p, bool inlist)
 682{
 683        struct pinctrl_state *state, *n1;
 684        struct pinctrl_setting *setting, *n2;
 685
 686        list_for_each_entry_safe(state, n1, &p->states, node) {
 687                list_for_each_entry_safe(setting, n2, &state->settings, node) {
 688                        switch (setting->type) {
 689                        case PIN_MAP_TYPE_MUX_GROUP:
 690                                if (state == p->state)
 691                                        pinmux_disable_setting(setting);
 692                                pinmux_free_setting(setting);
 693                                break;
 694                        case PIN_MAP_TYPE_CONFIGS_PIN:
 695                        case PIN_MAP_TYPE_CONFIGS_GROUP:
 696                                pinconf_free_setting(setting);
 697                                break;
 698                        default:
 699                                break;
 700                        }
 701                        list_del(&setting->node);
 702                        kfree(setting);
 703                }
 704                list_del(&state->node);
 705                kfree(state);
 706        }
 707
 708        pinctrl_dt_free_maps(p);
 709
 710        if (inlist)
 711                list_del(&p->node);
 712        kfree(p);
 713}
 714
 715/**
 716 * pinctrl_put() - release a previously claimed pinctrl handle
 717 * @p: the pinctrl handle to release
 718 */
 719void pinctrl_put(struct pinctrl *p)
 720{
 721        mutex_lock(&pinctrl_mutex);
 722        pinctrl_put_locked(p, true);
 723        mutex_unlock(&pinctrl_mutex);
 724}
 725EXPORT_SYMBOL_GPL(pinctrl_put);
 726
 727static struct pinctrl_state *pinctrl_lookup_state_locked(struct pinctrl *p,
 728                                                         const char *name)
 729{
 730        struct pinctrl_state *state;
 731
 732        state = find_state(p, name);
 733        if (!state) {
 734                if (pinctrl_dummy_state) {
 735                        /* create dummy state */
 736                        dev_dbg(p->dev, "using pinctrl dummy state (%s)\n",
 737                                name);
 738                        state = create_state(p, name);
 739                } else
 740                        state = ERR_PTR(-ENODEV);
 741        }
 742
 743        return state;
 744}
 745
 746/**
 747 * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle
 748 * @p: the pinctrl handle to retrieve the state from
 749 * @name: the state name to retrieve
 750 */
 751struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, const char *name)
 752{
 753        struct pinctrl_state *s;
 754
 755        mutex_lock(&pinctrl_mutex);
 756        s = pinctrl_lookup_state_locked(p, name);
 757        mutex_unlock(&pinctrl_mutex);
 758
 759        return s;
 760}
 761EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
 762
 763static int pinctrl_select_state_locked(struct pinctrl *p,
 764                                       struct pinctrl_state *state)
 765{
 766        struct pinctrl_setting *setting, *setting2;
 767        int ret;
 768
 769        if (p->state == state)
 770                return 0;
 771
 772        if (p->state) {
 773                /*
 774                 * The set of groups with a mux configuration in the old state
 775                 * may not be identical to the set of groups with a mux setting
 776                 * in the new state. While this might be unusual, it's entirely
 777                 * possible for the "user"-supplied mapping table to be written
 778                 * that way. For each group that was configured in the old state
 779                 * but not in the new state, this code puts that group into a
 780                 * safe/disabled state.
 781                 */
 782                list_for_each_entry(setting, &p->state->settings, node) {
 783                        bool found = false;
 784                        if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
 785                                continue;
 786                        list_for_each_entry(setting2, &state->settings, node) {
 787                                if (setting2->type != PIN_MAP_TYPE_MUX_GROUP)
 788                                        continue;
 789                                if (setting2->data.mux.group ==
 790                                                setting->data.mux.group) {
 791                                        found = true;
 792                                        break;
 793                                }
 794                        }
 795                        if (!found)
 796                                pinmux_disable_setting(setting);
 797                }
 798        }
 799
 800        p->state = state;
 801
 802        /* Apply all the settings for the new state */
 803        list_for_each_entry(setting, &state->settings, node) {
 804                switch (setting->type) {
 805                case PIN_MAP_TYPE_MUX_GROUP:
 806                        ret = pinmux_enable_setting(setting);
 807                        break;
 808                case PIN_MAP_TYPE_CONFIGS_PIN:
 809                case PIN_MAP_TYPE_CONFIGS_GROUP:
 810                        ret = pinconf_apply_setting(setting);
 811                        break;
 812                default:
 813                        ret = -EINVAL;
 814                        break;
 815                }
 816                if (ret < 0) {
 817                        /* FIXME: Difficult to return to prev state */
 818                        return ret;
 819                }
 820        }
 821
 822        return 0;
 823}
 824
 825/**
 826 * pinctrl_select() - select/activate/program a pinctrl state to HW
 827 * @p: the pinctrl handle for the device that requests configuratio
 828 * @state: the state handle to select/activate/program
 829 */
 830int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
 831{
 832        int ret;
 833
 834        mutex_lock(&pinctrl_mutex);
 835        ret = pinctrl_select_state_locked(p, state);
 836        mutex_unlock(&pinctrl_mutex);
 837
 838        return ret;
 839}
 840EXPORT_SYMBOL_GPL(pinctrl_select_state);
 841
 842static void devm_pinctrl_release(struct device *dev, void *res)
 843{
 844        pinctrl_put(*(struct pinctrl **)res);
 845}
 846
 847/**
 848 * struct devm_pinctrl_get() - Resource managed pinctrl_get()
 849 * @dev: the device to obtain the handle for
 850 *
 851 * If there is a need to explicitly destroy the returned struct pinctrl,
 852 * devm_pinctrl_put() should be used, rather than plain pinctrl_put().
 853 */
 854struct pinctrl *devm_pinctrl_get(struct device *dev)
 855{
 856        struct pinctrl **ptr, *p;
 857
 858        ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL);
 859        if (!ptr)
 860                return ERR_PTR(-ENOMEM);
 861
 862        p = pinctrl_get(dev);
 863        if (!IS_ERR(p)) {
 864                *ptr = p;
 865                devres_add(dev, ptr);
 866        } else {
 867                devres_free(ptr);
 868        }
 869
 870        return p;
 871}
 872EXPORT_SYMBOL_GPL(devm_pinctrl_get);
 873
 874static int devm_pinctrl_match(struct device *dev, void *res, void *data)
 875{
 876        struct pinctrl **p = res;
 877
 878        return *p == data;
 879}
 880
 881/**
 882 * devm_pinctrl_put() - Resource managed pinctrl_put()
 883 * @p: the pinctrl handle to release
 884 *
 885 * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally
 886 * this function will not need to be called and the resource management
 887 * code will ensure that the resource is freed.
 888 */
 889void devm_pinctrl_put(struct pinctrl *p)
 890{
 891        WARN_ON(devres_destroy(p->dev, devm_pinctrl_release,
 892                               devm_pinctrl_match, p));
 893        pinctrl_put(p);
 894}
 895EXPORT_SYMBOL_GPL(devm_pinctrl_put);
 896
 897int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,
 898                         bool dup, bool locked)
 899{
 900        int i, ret;
 901        struct pinctrl_maps *maps_node;
 902
 903        pr_debug("add %d pinmux maps\n", num_maps);
 904
 905        /* First sanity check the new mapping */
 906        for (i = 0; i < num_maps; i++) {
 907                if (!maps[i].dev_name) {
 908                        pr_err("failed to register map %s (%d): no device given\n",
 909                               maps[i].name, i);
 910                        return -EINVAL;
 911                }
 912
 913                if (!maps[i].name) {
 914                        pr_err("failed to register map %d: no map name given\n",
 915                               i);
 916                        return -EINVAL;
 917                }
 918
 919                if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE &&
 920                                !maps[i].ctrl_dev_name) {
 921                        pr_err("failed to register map %s (%d): no pin control device given\n",
 922                               maps[i].name, i);
 923                        return -EINVAL;
 924                }
 925
 926                switch (maps[i].type) {
 927                case PIN_MAP_TYPE_DUMMY_STATE:
 928                        break;
 929                case PIN_MAP_TYPE_MUX_GROUP:
 930                        ret = pinmux_validate_map(&maps[i], i);
 931                        if (ret < 0)
 932                                return ret;
 933                        break;
 934                case PIN_MAP_TYPE_CONFIGS_PIN:
 935                case PIN_MAP_TYPE_CONFIGS_GROUP:
 936                        ret = pinconf_validate_map(&maps[i], i);
 937                        if (ret < 0)
 938                                return ret;
 939                        break;
 940                default:
 941                        pr_err("failed to register map %s (%d): invalid type given\n",
 942                               maps[i].name, i);
 943                        return -EINVAL;
 944                }
 945        }
 946
 947        maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL);
 948        if (!maps_node) {
 949                pr_err("failed to alloc struct pinctrl_maps\n");
 950                return -ENOMEM;
 951        }
 952
 953        maps_node->num_maps = num_maps;
 954        if (dup) {
 955                maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps,
 956                                          GFP_KERNEL);
 957                if (!maps_node->maps) {
 958                        pr_err("failed to duplicate mapping table\n");
 959                        kfree(maps_node);
 960                        return -ENOMEM;
 961                }
 962        } else {
 963                maps_node->maps = maps;
 964        }
 965
 966        if (!locked)
 967                mutex_lock(&pinctrl_mutex);
 968        list_add_tail(&maps_node->node, &pinctrl_maps);
 969        if (!locked)
 970                mutex_unlock(&pinctrl_mutex);
 971
 972        return 0;
 973}
 974
 975/**
 976 * pinctrl_register_mappings() - register a set of pin controller mappings
 977 * @maps: the pincontrol mappings table to register. This should probably be
 978 *      marked with __initdata so it can be discarded after boot. This
 979 *      function will perform a shallow copy for the mapping entries.
 980 * @num_maps: the number of maps in the mapping table
 981 */
 982int pinctrl_register_mappings(struct pinctrl_map const *maps,
 983                              unsigned num_maps)
 984{
 985        return pinctrl_register_map(maps, num_maps, true, false);
 986}
 987
 988void pinctrl_unregister_map(struct pinctrl_map const *map)
 989{
 990        struct pinctrl_maps *maps_node;
 991
 992        list_for_each_entry(maps_node, &pinctrl_maps, node) {
 993                if (maps_node->maps == map) {
 994                        list_del(&maps_node->node);
 995                        return;
 996                }
 997        }
 998}
 999
1000#ifdef CONFIG_DEBUG_FS
1001
1002static int pinctrl_pins_show(struct seq_file *s, void *what)
1003{
1004        struct pinctrl_dev *pctldev = s->private;
1005        const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1006        unsigned i, pin;
1007
1008        seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
1009
1010        mutex_lock(&pinctrl_mutex);
1011
1012        /* The pin number can be retrived from the pin controller descriptor */
1013        for (i = 0; i < pctldev->desc->npins; i++) {
1014                struct pin_desc *desc;
1015
1016                pin = pctldev->desc->pins[i].number;
1017                desc = pin_desc_get(pctldev, pin);
1018                /* Pin space may be sparse */
1019                if (desc == NULL)
1020                        continue;
1021
1022                seq_printf(s, "pin %d (%s) ", pin,
1023                           desc->name ? desc->name : "unnamed");
1024
1025                /* Driver-specific info per pin */
1026                if (ops->pin_dbg_show)
1027                        ops->pin_dbg_show(pctldev, s, pin);
1028
1029                seq_puts(s, "\n");
1030        }
1031
1032        mutex_unlock(&pinctrl_mutex);
1033
1034        return 0;
1035}
1036
1037static int pinctrl_groups_show(struct seq_file *s, void *what)
1038{
1039        struct pinctrl_dev *pctldev = s->private;
1040        const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1041        unsigned ngroups, selector = 0;
1042
1043        ngroups = ops->get_groups_count(pctldev);
1044        mutex_lock(&pinctrl_mutex);
1045
1046        seq_puts(s, "registered pin groups:\n");
1047        while (selector < ngroups) {
1048                const unsigned *pins;
1049                unsigned num_pins;
1050                const char *gname = ops->get_group_name(pctldev, selector);
1051                const char *pname;
1052                int ret;
1053                int i;
1054
1055                ret = ops->get_group_pins(pctldev, selector,
1056                                          &pins, &num_pins);
1057                if (ret)
1058                        seq_printf(s, "%s [ERROR GETTING PINS]\n",
1059                                   gname);
1060                else {
1061                        seq_printf(s, "group: %s\n", gname);
1062                        for (i = 0; i < num_pins; i++) {
1063                                pname = pin_get_name(pctldev, pins[i]);
1064                                if (WARN_ON(!pname)) {
1065                                        mutex_unlock(&pinctrl_mutex);
1066                                        return -EINVAL;
1067                                }
1068                                seq_printf(s, "pin %d (%s)\n", pins[i], pname);
1069                        }
1070                        seq_puts(s, "\n");
1071                }
1072                selector++;
1073        }
1074
1075        mutex_unlock(&pinctrl_mutex);
1076
1077        return 0;
1078}
1079
1080static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
1081{
1082        struct pinctrl_dev *pctldev = s->private;
1083        struct pinctrl_gpio_range *range = NULL;
1084
1085        seq_puts(s, "GPIO ranges handled:\n");
1086
1087        mutex_lock(&pinctrl_mutex);
1088
1089        /* Loop over the ranges */
1090        list_for_each_entry(range, &pctldev->gpio_ranges, node) {
1091                seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
1092                           range->id, range->name,
1093                           range->base, (range->base + range->npins - 1),
1094                           range->pin_base,
1095                           (range->pin_base + range->npins - 1));
1096        }
1097
1098        mutex_unlock(&pinctrl_mutex);
1099
1100        return 0;
1101}
1102
1103static int pinctrl_devices_show(struct seq_file *s, void *what)
1104{
1105        struct pinctrl_dev *pctldev;
1106
1107        seq_puts(s, "name [pinmux] [pinconf]\n");
1108
1109        mutex_lock(&pinctrl_mutex);
1110
1111        list_for_each_entry(pctldev, &pinctrldev_list, node) {
1112                seq_printf(s, "%s ", pctldev->desc->name);
1113                if (pctldev->desc->pmxops)
1114                        seq_puts(s, "yes ");
1115                else
1116                        seq_puts(s, "no ");
1117                if (pctldev->desc->confops)
1118                        seq_puts(s, "yes");
1119                else
1120                        seq_puts(s, "no");
1121                seq_puts(s, "\n");
1122        }
1123
1124        mutex_unlock(&pinctrl_mutex);
1125
1126        return 0;
1127}
1128
1129static inline const char *map_type(enum pinctrl_map_type type)
1130{
1131        static const char * const names[] = {
1132                "INVALID",
1133                "DUMMY_STATE",
1134                "MUX_GROUP",
1135                "CONFIGS_PIN",
1136                "CONFIGS_GROUP",
1137        };
1138
1139        if (type >= ARRAY_SIZE(names))
1140                return "UNKNOWN";
1141
1142        return names[type];
1143}
1144
1145static int pinctrl_maps_show(struct seq_file *s, void *what)
1146{
1147        struct pinctrl_maps *maps_node;
1148        int i;
1149        struct pinctrl_map const *map;
1150
1151        seq_puts(s, "Pinctrl maps:\n");
1152
1153        mutex_lock(&pinctrl_mutex);
1154
1155        for_each_maps(maps_node, i, map) {
1156                seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n",
1157                           map->dev_name, map->name, map_type(map->type),
1158                           map->type);
1159
1160                if (map->type != PIN_MAP_TYPE_DUMMY_STATE)
1161                        seq_printf(s, "controlling device %s\n",
1162                                   map->ctrl_dev_name);
1163
1164                switch (map->type) {
1165                case PIN_MAP_TYPE_MUX_GROUP:
1166                        pinmux_show_map(s, map);
1167                        break;
1168                case PIN_MAP_TYPE_CONFIGS_PIN:
1169                case PIN_MAP_TYPE_CONFIGS_GROUP:
1170                        pinconf_show_map(s, map);
1171                        break;
1172                default:
1173                        break;
1174                }
1175
1176                seq_printf(s, "\n");
1177        }
1178
1179        mutex_unlock(&pinctrl_mutex);
1180
1181        return 0;
1182}
1183
1184static int pinctrl_show(struct seq_file *s, void *what)
1185{
1186        struct pinctrl *p;
1187        struct pinctrl_state *state;
1188        struct pinctrl_setting *setting;
1189
1190        seq_puts(s, "Requested pin control handlers their pinmux maps:\n");
1191
1192        mutex_lock(&pinctrl_mutex);
1193
1194        list_for_each_entry(p, &pinctrl_list, node) {
1195                seq_printf(s, "device: %s current state: %s\n",
1196                           dev_name(p->dev),
1197                           p->state ? p->state->name : "none");
1198
1199                list_for_each_entry(state, &p->states, node) {
1200                        seq_printf(s, "  state: %s\n", state->name);
1201
1202                        list_for_each_entry(setting, &state->settings, node) {
1203                                struct pinctrl_dev *pctldev = setting->pctldev;
1204
1205                                seq_printf(s, "    type: %s controller %s ",
1206                                           map_type(setting->type),
1207                                           pinctrl_dev_get_name(pctldev));
1208
1209                                switch (setting->type) {
1210                                case PIN_MAP_TYPE_MUX_GROUP:
1211                                        pinmux_show_setting(s, setting);
1212                                        break;
1213                                case PIN_MAP_TYPE_CONFIGS_PIN:
1214                                case PIN_MAP_TYPE_CONFIGS_GROUP:
1215                                        pinconf_show_setting(s, setting);
1216                                        break;
1217                                default:
1218                                        break;
1219                                }
1220                        }
1221                }
1222        }
1223
1224        mutex_unlock(&pinctrl_mutex);
1225
1226        return 0;
1227}
1228
1229static int pinctrl_pins_open(struct inode *inode, struct file *file)
1230{
1231        return single_open(file, pinctrl_pins_show, inode->i_private);
1232}
1233
1234static int pinctrl_groups_open(struct inode *inode, struct file *file)
1235{
1236        return single_open(file, pinctrl_groups_show, inode->i_private);
1237}
1238
1239static int pinctrl_gpioranges_open(struct inode *inode, struct file *file)
1240{
1241        return single_open(file, pinctrl_gpioranges_show, inode->i_private);
1242}
1243
1244static int pinctrl_devices_open(struct inode *inode, struct file *file)
1245{
1246        return single_open(file, pinctrl_devices_show, NULL);
1247}
1248
1249static int pinctrl_maps_open(struct inode *inode, struct file *file)
1250{
1251        return single_open(file, pinctrl_maps_show, NULL);
1252}
1253
1254static int pinctrl_open(struct inode *inode, struct file *file)
1255{
1256        return single_open(file, pinctrl_show, NULL);
1257}
1258
1259static const struct file_operations pinctrl_pins_ops = {
1260        .open           = pinctrl_pins_open,
1261        .read           = seq_read,
1262        .llseek         = seq_lseek,
1263        .release        = single_release,
1264};
1265
1266static const struct file_operations pinctrl_groups_ops = {
1267        .open           = pinctrl_groups_open,
1268        .read           = seq_read,
1269        .llseek         = seq_lseek,
1270        .release        = single_release,
1271};
1272
1273static const struct file_operations pinctrl_gpioranges_ops = {
1274        .open           = pinctrl_gpioranges_open,
1275        .read           = seq_read,
1276        .llseek         = seq_lseek,
1277        .release        = single_release,
1278};
1279
1280static const struct file_operations pinctrl_devices_ops = {
1281        .open           = pinctrl_devices_open,
1282        .read           = seq_read,
1283        .llseek         = seq_lseek,
1284        .release        = single_release,
1285};
1286
1287static const struct file_operations pinctrl_maps_ops = {
1288        .open           = pinctrl_maps_open,
1289        .read           = seq_read,
1290        .llseek         = seq_lseek,
1291        .release        = single_release,
1292};
1293
1294static const struct file_operations pinctrl_ops = {
1295        .open           = pinctrl_open,
1296        .read           = seq_read,
1297        .llseek         = seq_lseek,
1298        .release        = single_release,
1299};
1300
1301static struct dentry *debugfs_root;
1302
1303static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1304{
1305        struct dentry *device_root;
1306
1307        device_root = debugfs_create_dir(dev_name(pctldev->dev),
1308                                         debugfs_root);
1309        pctldev->device_root = device_root;
1310
1311        if (IS_ERR(device_root) || !device_root) {
1312                pr_warn("failed to create debugfs directory for %s\n",
1313                        dev_name(pctldev->dev));
1314                return;
1315        }
1316        debugfs_create_file("pins", S_IFREG | S_IRUGO,
1317                            device_root, pctldev, &pinctrl_pins_ops);
1318        debugfs_create_file("pingroups", S_IFREG | S_IRUGO,
1319                            device_root, pctldev, &pinctrl_groups_ops);
1320        debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO,
1321                            device_root, pctldev, &pinctrl_gpioranges_ops);
1322        pinmux_init_device_debugfs(device_root, pctldev);
1323        pinconf_init_device_debugfs(device_root, pctldev);
1324}
1325
1326static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1327{
1328        debugfs_remove_recursive(pctldev->device_root);
1329}
1330
1331static void pinctrl_init_debugfs(void)
1332{
1333        debugfs_root = debugfs_create_dir("pinctrl", NULL);
1334        if (IS_ERR(debugfs_root) || !debugfs_root) {
1335                pr_warn("failed to create debugfs directory\n");
1336                debugfs_root = NULL;
1337                return;
1338        }
1339
1340        debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO,
1341                            debugfs_root, NULL, &pinctrl_devices_ops);
1342        debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO,
1343                            debugfs_root, NULL, &pinctrl_maps_ops);
1344        debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO,
1345                            debugfs_root, NULL, &pinctrl_ops);
1346}
1347
1348#else /* CONFIG_DEBUG_FS */
1349
1350static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1351{
1352}
1353
1354static void pinctrl_init_debugfs(void)
1355{
1356}
1357
1358static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1359{
1360}
1361
1362#endif
1363
1364static int pinctrl_check_ops(struct pinctrl_dev *pctldev)
1365{
1366        const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1367
1368        if (!ops ||
1369            !ops->get_groups_count ||
1370            !ops->get_group_name ||
1371            !ops->get_group_pins)
1372                return -EINVAL;
1373
1374        if (ops->dt_node_to_map && !ops->dt_free_map)
1375                return -EINVAL;
1376
1377        return 0;
1378}
1379
1380/**
1381 * pinctrl_register() - register a pin controller device
1382 * @pctldesc: descriptor for this pin controller
1383 * @dev: parent device for this pin controller
1384 * @driver_data: private pin controller data for this pin controller
1385 */
1386struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
1387                                    struct device *dev, void *driver_data)
1388{
1389        struct pinctrl_dev *pctldev;
1390        int ret;
1391
1392        if (!pctldesc)
1393                return NULL;
1394        if (!pctldesc->name)
1395                return NULL;
1396
1397        pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL);
1398        if (pctldev == NULL) {
1399                dev_err(dev, "failed to alloc struct pinctrl_dev\n");
1400                return NULL;
1401        }
1402
1403        /* Initialize pin control device struct */
1404        pctldev->owner = pctldesc->owner;
1405        pctldev->desc = pctldesc;
1406        pctldev->driver_data = driver_data;
1407        INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
1408        INIT_LIST_HEAD(&pctldev->gpio_ranges);
1409        pctldev->dev = dev;
1410
1411        /* check core ops for sanity */
1412        if (pinctrl_check_ops(pctldev)) {
1413                dev_err(dev, "pinctrl ops lacks necessary functions\n");
1414                goto out_err;
1415        }
1416
1417        /* If we're implementing pinmuxing, check the ops for sanity */
1418        if (pctldesc->pmxops) {
1419                if (pinmux_check_ops(pctldev))
1420                        goto out_err;
1421        }
1422
1423        /* If we're implementing pinconfig, check the ops for sanity */
1424        if (pctldesc->confops) {
1425                if (pinconf_check_ops(pctldev))
1426                        goto out_err;
1427        }
1428
1429        /* Register all the pins */
1430        dev_dbg(dev, "try to register %d pins ...\n",  pctldesc->npins);
1431        ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins);
1432        if (ret) {
1433                dev_err(dev, "error during pin registration\n");
1434                pinctrl_free_pindescs(pctldev, pctldesc->pins,
1435                                      pctldesc->npins);
1436                goto out_err;
1437        }
1438
1439        mutex_lock(&pinctrl_mutex);
1440
1441        list_add_tail(&pctldev->node, &pinctrldev_list);
1442
1443        pctldev->p = pinctrl_get_locked(pctldev->dev);
1444        if (!IS_ERR(pctldev->p)) {
1445                struct pinctrl_state *s =
1446                        pinctrl_lookup_state_locked(pctldev->p,
1447                                                    PINCTRL_STATE_DEFAULT);
1448                if (IS_ERR(s)) {
1449                        dev_dbg(dev, "failed to lookup the default state\n");
1450                } else {
1451                        if (pinctrl_select_state_locked(pctldev->p, s))
1452                                dev_err(dev,
1453                                        "failed to select default state\n");
1454                }
1455        }
1456
1457        mutex_unlock(&pinctrl_mutex);
1458
1459        pinctrl_init_device_debugfs(pctldev);
1460
1461        return pctldev;
1462
1463out_err:
1464        kfree(pctldev);
1465        return NULL;
1466}
1467EXPORT_SYMBOL_GPL(pinctrl_register);
1468
1469/**
1470 * pinctrl_unregister() - unregister pinmux
1471 * @pctldev: pin controller to unregister
1472 *
1473 * Called by pinmux drivers to unregister a pinmux.
1474 */
1475void pinctrl_unregister(struct pinctrl_dev *pctldev)
1476{
1477        struct pinctrl_gpio_range *range, *n;
1478        if (pctldev == NULL)
1479                return;
1480
1481        pinctrl_remove_device_debugfs(pctldev);
1482
1483        mutex_lock(&pinctrl_mutex);
1484
1485        if (!IS_ERR(pctldev->p))
1486                pinctrl_put_locked(pctldev->p, true);
1487
1488        /* TODO: check that no pinmuxes are still active? */
1489        list_del(&pctldev->node);
1490        /* Destroy descriptor tree */
1491        pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
1492                              pctldev->desc->npins);
1493        /* remove gpio ranges map */
1494        list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node)
1495                list_del(&range->node);
1496
1497        kfree(pctldev);
1498
1499        mutex_unlock(&pinctrl_mutex);
1500}
1501EXPORT_SYMBOL_GPL(pinctrl_unregister);
1502
1503static int __init pinctrl_init(void)
1504{
1505        pr_info("initialized pinctrl subsystem\n");
1506        pinctrl_init_debugfs();
1507        return 0;
1508}
1509
1510/* init early since many drivers really need to initialized pinmux early */
1511core_initcall(pinctrl_init);
1512
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