linux/drivers/pinctrl/core.c
<<
>>
Prefs
   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                        return -ENOMEM;
 235                pindesc->dynamic_name = true;
 236        }
 237
 238        radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc);
 239        pr_debug("registered pin %d (%s) on %s\n",
 240                 number, pindesc->name, pctldev->desc->name);
 241        return 0;
 242}
 243
 244static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
 245                                 struct pinctrl_pin_desc const *pins,
 246                                 unsigned num_descs)
 247{
 248        unsigned i;
 249        int ret = 0;
 250
 251        for (i = 0; i < num_descs; i++) {
 252                ret = pinctrl_register_one_pin(pctldev,
 253                                               pins[i].number, pins[i].name);
 254                if (ret)
 255                        return ret;
 256        }
 257
 258        return 0;
 259}
 260
 261/**
 262 * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
 263 * @pctldev: pin controller device to check
 264 * @gpio: gpio pin to check taken from the global GPIO pin space
 265 *
 266 * Tries to match a GPIO pin number to the ranges handled by a certain pin
 267 * controller, return the range or NULL
 268 */
 269static struct pinctrl_gpio_range *
 270pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
 271{
 272        struct pinctrl_gpio_range *range = NULL;
 273
 274        /* Loop over the ranges */
 275        list_for_each_entry(range, &pctldev->gpio_ranges, node) {
 276                /* Check if we're in the valid range */
 277                if (gpio >= range->base &&
 278                    gpio < range->base + range->npins) {
 279                        return range;
 280                }
 281        }
 282
 283        return NULL;
 284}
 285
 286/**
 287 * pinctrl_get_device_gpio_range() - find device for GPIO range
 288 * @gpio: the pin to locate the pin controller for
 289 * @outdev: the pin control device if found
 290 * @outrange: the GPIO range if found
 291 *
 292 * Find the pin controller handling a certain GPIO pin from the pinspace of
 293 * the GPIO subsystem, return the device and the matching GPIO range. Returns
 294 * -EPROBE_DEFER if the GPIO range could not be found in any device since it
 295 * may still have not been registered.
 296 */
 297static int pinctrl_get_device_gpio_range(unsigned gpio,
 298                                         struct pinctrl_dev **outdev,
 299                                         struct pinctrl_gpio_range **outrange)
 300{
 301        struct pinctrl_dev *pctldev = NULL;
 302
 303        /* Loop over the pin controllers */
 304        list_for_each_entry(pctldev, &pinctrldev_list, node) {
 305                struct pinctrl_gpio_range *range;
 306
 307                range = pinctrl_match_gpio_range(pctldev, gpio);
 308                if (range != NULL) {
 309                        *outdev = pctldev;
 310                        *outrange = range;
 311                        return 0;
 312                }
 313        }
 314
 315        return -EPROBE_DEFER;
 316}
 317
 318/**
 319 * pinctrl_add_gpio_range() - register a GPIO range for a controller
 320 * @pctldev: pin controller device to add the range to
 321 * @range: the GPIO range to add
 322 *
 323 * This adds a range of GPIOs to be handled by a certain pin controller. Call
 324 * this to register handled ranges after registering your pin controller.
 325 */
 326void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
 327                            struct pinctrl_gpio_range *range)
 328{
 329        mutex_lock(&pinctrl_mutex);
 330        list_add_tail(&range->node, &pctldev->gpio_ranges);
 331        mutex_unlock(&pinctrl_mutex);
 332}
 333EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
 334
 335void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
 336                             struct pinctrl_gpio_range *ranges,
 337                             unsigned nranges)
 338{
 339        int i;
 340
 341        for (i = 0; i < nranges; i++)
 342                pinctrl_add_gpio_range(pctldev, &ranges[i]);
 343}
 344EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges);
 345
 346/**
 347 * pinctrl_get_group_selector() - returns the group selector for a group
 348 * @pctldev: the pin controller handling the group
 349 * @pin_group: the pin group to look up
 350 */
 351int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
 352                               const char *pin_group)
 353{
 354        const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 355        unsigned ngroups = pctlops->get_groups_count(pctldev);
 356        unsigned group_selector = 0;
 357
 358        while (group_selector < ngroups) {
 359                const char *gname = pctlops->get_group_name(pctldev,
 360                                                            group_selector);
 361                if (!strcmp(gname, pin_group)) {
 362                        dev_dbg(pctldev->dev,
 363                                "found group selector %u for %s\n",
 364                                group_selector,
 365                                pin_group);
 366                        return group_selector;
 367                }
 368
 369                group_selector++;
 370        }
 371
 372        dev_err(pctldev->dev, "does not have pin group %s\n",
 373                pin_group);
 374
 375        return -EINVAL;
 376}
 377
 378/**
 379 * pinctrl_request_gpio() - request a single pin to be used in as GPIO
 380 * @gpio: the GPIO pin number from the GPIO subsystem number space
 381 *
 382 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
 383 * as part of their gpio_request() semantics, platforms and individual drivers
 384 * shall *NOT* request GPIO pins to be muxed in.
 385 */
 386int pinctrl_request_gpio(unsigned gpio)
 387{
 388        struct pinctrl_dev *pctldev;
 389        struct pinctrl_gpio_range *range;
 390        int ret;
 391        int pin;
 392
 393        mutex_lock(&pinctrl_mutex);
 394
 395        ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
 396        if (ret) {
 397                mutex_unlock(&pinctrl_mutex);
 398                return ret;
 399        }
 400
 401        /* Convert to the pin controllers number space */
 402        pin = gpio - range->base + range->pin_base;
 403
 404        ret = pinmux_request_gpio(pctldev, range, pin, gpio);
 405
 406        mutex_unlock(&pinctrl_mutex);
 407        return ret;
 408}
 409EXPORT_SYMBOL_GPL(pinctrl_request_gpio);
 410
 411/**
 412 * pinctrl_free_gpio() - free control on a single pin, currently used as GPIO
 413 * @gpio: the GPIO pin number from the GPIO subsystem number space
 414 *
 415 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
 416 * as part of their gpio_free() semantics, platforms and individual drivers
 417 * shall *NOT* request GPIO pins to be muxed out.
 418 */
 419void pinctrl_free_gpio(unsigned gpio)
 420{
 421        struct pinctrl_dev *pctldev;
 422        struct pinctrl_gpio_range *range;
 423        int ret;
 424        int pin;
 425
 426        mutex_lock(&pinctrl_mutex);
 427
 428        ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
 429        if (ret) {
 430                mutex_unlock(&pinctrl_mutex);
 431                return;
 432        }
 433
 434        /* Convert to the pin controllers number space */
 435        pin = gpio - range->base + range->pin_base;
 436
 437        pinmux_free_gpio(pctldev, pin, range);
 438
 439        mutex_unlock(&pinctrl_mutex);
 440}
 441EXPORT_SYMBOL_GPL(pinctrl_free_gpio);
 442
 443static int pinctrl_gpio_direction(unsigned gpio, bool input)
 444{
 445        struct pinctrl_dev *pctldev;
 446        struct pinctrl_gpio_range *range;
 447        int ret;
 448        int pin;
 449
 450        ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
 451        if (ret)
 452                return ret;
 453
 454        /* Convert to the pin controllers number space */
 455        pin = gpio - range->base + range->pin_base;
 456
 457        return pinmux_gpio_direction(pctldev, range, pin, input);
 458}
 459
 460/**
 461 * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode
 462 * @gpio: the GPIO pin number from the GPIO subsystem number space
 463 *
 464 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
 465 * as part of their gpio_direction_input() semantics, platforms and individual
 466 * drivers shall *NOT* touch pin control GPIO calls.
 467 */
 468int pinctrl_gpio_direction_input(unsigned gpio)
 469{
 470        int ret;
 471        mutex_lock(&pinctrl_mutex);
 472        ret = pinctrl_gpio_direction(gpio, true);
 473        mutex_unlock(&pinctrl_mutex);
 474        return ret;
 475}
 476EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
 477
 478/**
 479 * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode
 480 * @gpio: the GPIO pin number from the GPIO subsystem number space
 481 *
 482 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
 483 * as part of their gpio_direction_output() semantics, platforms and individual
 484 * drivers shall *NOT* touch pin control GPIO calls.
 485 */
 486int pinctrl_gpio_direction_output(unsigned gpio)
 487{
 488        int ret;
 489        mutex_lock(&pinctrl_mutex);
 490        ret = pinctrl_gpio_direction(gpio, false);
 491        mutex_unlock(&pinctrl_mutex);
 492        return ret;
 493}
 494EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
 495
 496static struct pinctrl_state *find_state(struct pinctrl *p,
 497                                        const char *name)
 498{
 499        struct pinctrl_state *state;
 500
 501        list_for_each_entry(state, &p->states, node)
 502                if (!strcmp(state->name, name))
 503                        return state;
 504
 505        return NULL;
 506}
 507
 508static struct pinctrl_state *create_state(struct pinctrl *p,
 509                                          const char *name)
 510{
 511        struct pinctrl_state *state;
 512
 513        state = kzalloc(sizeof(*state), GFP_KERNEL);
 514        if (state == NULL) {
 515                dev_err(p->dev,
 516                        "failed to alloc struct pinctrl_state\n");
 517                return ERR_PTR(-ENOMEM);
 518        }
 519
 520        state->name = name;
 521        INIT_LIST_HEAD(&state->settings);
 522
 523        list_add_tail(&state->node, &p->states);
 524
 525        return state;
 526}
 527
 528static int add_setting(struct pinctrl *p, struct pinctrl_map const *map)
 529{
 530        struct pinctrl_state *state;
 531        struct pinctrl_setting *setting;
 532        int ret;
 533
 534        state = find_state(p, map->name);
 535        if (!state)
 536                state = create_state(p, map->name);
 537        if (IS_ERR(state))
 538                return PTR_ERR(state);
 539
 540        if (map->type == PIN_MAP_TYPE_DUMMY_STATE)
 541                return 0;
 542
 543        setting = kzalloc(sizeof(*setting), GFP_KERNEL);
 544        if (setting == NULL) {
 545                dev_err(p->dev,
 546                        "failed to alloc struct pinctrl_setting\n");
 547                return -ENOMEM;
 548        }
 549
 550        setting->type = map->type;
 551
 552        setting->pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
 553        if (setting->pctldev == NULL) {
 554                dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe",
 555                        map->ctrl_dev_name);
 556                kfree(setting);
 557                /*
 558                 * OK let us guess that the driver is not there yet, and
 559                 * let's defer obtaining this pinctrl handle to later...
 560                 */
 561                return -EPROBE_DEFER;
 562        }
 563
 564        switch (map->type) {
 565        case PIN_MAP_TYPE_MUX_GROUP:
 566                ret = pinmux_map_to_setting(map, setting);
 567                break;
 568        case PIN_MAP_TYPE_CONFIGS_PIN:
 569        case PIN_MAP_TYPE_CONFIGS_GROUP:
 570                ret = pinconf_map_to_setting(map, setting);
 571                break;
 572        default:
 573                ret = -EINVAL;
 574                break;
 575        }
 576        if (ret < 0) {
 577                kfree(setting);
 578                return ret;
 579        }
 580
 581        list_add_tail(&setting->node, &state->settings);
 582
 583        return 0;
 584}
 585
 586static struct pinctrl *find_pinctrl(struct device *dev)
 587{
 588        struct pinctrl *p;
 589
 590        list_for_each_entry(p, &pinctrl_list, node)
 591                if (p->dev == dev)
 592                        return p;
 593
 594        return NULL;
 595}
 596
 597static void pinctrl_put_locked(struct pinctrl *p, bool inlist);
 598
 599static struct pinctrl *create_pinctrl(struct device *dev)
 600{
 601        struct pinctrl *p;
 602        const char *devname;
 603        struct pinctrl_maps *maps_node;
 604        int i;
 605        struct pinctrl_map const *map;
 606        int ret;
 607
 608        /*
 609         * create the state cookie holder struct pinctrl for each
 610         * mapping, this is what consumers will get when requesting
 611         * a pin control handle with pinctrl_get()
 612         */
 613        p = kzalloc(sizeof(*p), GFP_KERNEL);
 614        if (p == NULL) {
 615                dev_err(dev, "failed to alloc struct pinctrl\n");
 616                return ERR_PTR(-ENOMEM);
 617        }
 618        p->dev = dev;
 619        INIT_LIST_HEAD(&p->states);
 620        INIT_LIST_HEAD(&p->dt_maps);
 621
 622        ret = pinctrl_dt_to_map(p);
 623        if (ret < 0) {
 624                kfree(p);
 625                return ERR_PTR(ret);
 626        }
 627
 628        devname = dev_name(dev);
 629
 630        /* Iterate over the pin control maps to locate the right ones */
 631        for_each_maps(maps_node, i, map) {
 632                /* Map must be for this device */
 633                if (strcmp(map->dev_name, devname))
 634                        continue;
 635
 636                ret = add_setting(p, map);
 637                if (ret < 0) {
 638                        pinctrl_put_locked(p, false);
 639                        return ERR_PTR(ret);
 640                }
 641        }
 642
 643        /* Add the pinmux to the global list */
 644        list_add_tail(&p->node, &pinctrl_list);
 645
 646        return p;
 647}
 648
 649static struct pinctrl *pinctrl_get_locked(struct device *dev)
 650{
 651        struct pinctrl *p;
 652
 653        if (WARN_ON(!dev))
 654                return ERR_PTR(-EINVAL);
 655
 656        p = find_pinctrl(dev);
 657        if (p != NULL)
 658                return ERR_PTR(-EBUSY);
 659
 660        return create_pinctrl(dev);
 661}
 662
 663/**
 664 * pinctrl_get() - retrieves the pinctrl handle for a device
 665 * @dev: the device to obtain the handle for
 666 */
 667struct pinctrl *pinctrl_get(struct device *dev)
 668{
 669        struct pinctrl *p;
 670
 671        mutex_lock(&pinctrl_mutex);
 672        p = pinctrl_get_locked(dev);
 673        mutex_unlock(&pinctrl_mutex);
 674
 675        return p;
 676}
 677EXPORT_SYMBOL_GPL(pinctrl_get);
 678
 679static void pinctrl_put_locked(struct pinctrl *p, bool inlist)
 680{
 681        struct pinctrl_state *state, *n1;
 682        struct pinctrl_setting *setting, *n2;
 683
 684        list_for_each_entry_safe(state, n1, &p->states, node) {
 685                list_for_each_entry_safe(setting, n2, &state->settings, node) {
 686                        switch (setting->type) {
 687                        case PIN_MAP_TYPE_MUX_GROUP:
 688                                if (state == p->state)
 689                                        pinmux_disable_setting(setting);
 690                                pinmux_free_setting(setting);
 691                                break;
 692                        case PIN_MAP_TYPE_CONFIGS_PIN:
 693                        case PIN_MAP_TYPE_CONFIGS_GROUP:
 694                                pinconf_free_setting(setting);
 695                                break;
 696                        default:
 697                                break;
 698                        }
 699                        list_del(&setting->node);
 700                        kfree(setting);
 701                }
 702                list_del(&state->node);
 703                kfree(state);
 704        }
 705
 706        pinctrl_dt_free_maps(p);
 707
 708        if (inlist)
 709                list_del(&p->node);
 710        kfree(p);
 711}
 712
 713/**
 714 * pinctrl_put() - release a previously claimed pinctrl handle
 715 * @p: the pinctrl handle to release
 716 */
 717void pinctrl_put(struct pinctrl *p)
 718{
 719        mutex_lock(&pinctrl_mutex);
 720        pinctrl_put_locked(p, true);
 721        mutex_unlock(&pinctrl_mutex);
 722}
 723EXPORT_SYMBOL_GPL(pinctrl_put);
 724
 725static struct pinctrl_state *pinctrl_lookup_state_locked(struct pinctrl *p,
 726                                                         const char *name)
 727{
 728        struct pinctrl_state *state;
 729
 730        state = find_state(p, name);
 731        if (!state) {
 732                if (pinctrl_dummy_state) {
 733                        /* create dummy state */
 734                        dev_dbg(p->dev, "using pinctrl dummy state (%s)\n",
 735                                name);
 736                        state = create_state(p, name);
 737                } else
 738                        state = ERR_PTR(-ENODEV);
 739        }
 740
 741        return state;
 742}
 743
 744/**
 745 * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle
 746 * @p: the pinctrl handle to retrieve the state from
 747 * @name: the state name to retrieve
 748 */
 749struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, const char *name)
 750{
 751        struct pinctrl_state *s;
 752
 753        mutex_lock(&pinctrl_mutex);
 754        s = pinctrl_lookup_state_locked(p, name);
 755        mutex_unlock(&pinctrl_mutex);
 756
 757        return s;
 758}
 759EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
 760
 761static int pinctrl_select_state_locked(struct pinctrl *p,
 762                                       struct pinctrl_state *state)
 763{
 764        struct pinctrl_setting *setting, *setting2;
 765        int ret;
 766
 767        if (p->state == state)
 768                return 0;
 769
 770        if (p->state) {
 771                /*
 772                 * The set of groups with a mux configuration in the old state
 773                 * may not be identical to the set of groups with a mux setting
 774                 * in the new state. While this might be unusual, it's entirely
 775                 * possible for the "user"-supplied mapping table to be written
 776                 * that way. For each group that was configured in the old state
 777                 * but not in the new state, this code puts that group into a
 778                 * safe/disabled state.
 779                 */
 780                list_for_each_entry(setting, &p->state->settings, node) {
 781                        bool found = false;
 782                        if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
 783                                continue;
 784                        list_for_each_entry(setting2, &state->settings, node) {
 785                                if (setting2->type != PIN_MAP_TYPE_MUX_GROUP)
 786                                        continue;
 787                                if (setting2->data.mux.group ==
 788                                                setting->data.mux.group) {
 789                                        found = true;
 790                                        break;
 791                                }
 792                        }
 793                        if (!found)
 794                                pinmux_disable_setting(setting);
 795                }
 796        }
 797
 798        p->state = state;
 799
 800        /* Apply all the settings for the new state */
 801        list_for_each_entry(setting, &state->settings, node) {
 802                switch (setting->type) {
 803                case PIN_MAP_TYPE_MUX_GROUP:
 804                        ret = pinmux_enable_setting(setting);
 805                        break;
 806                case PIN_MAP_TYPE_CONFIGS_PIN:
 807                case PIN_MAP_TYPE_CONFIGS_GROUP:
 808                        ret = pinconf_apply_setting(setting);
 809                        break;
 810                default:
 811                        ret = -EINVAL;
 812                        break;
 813                }
 814                if (ret < 0) {
 815                        /* FIXME: Difficult to return to prev state */
 816                        return ret;
 817                }
 818        }
 819
 820        return 0;
 821}
 822
 823/**
 824 * pinctrl_select() - select/activate/program a pinctrl state to HW
 825 * @p: the pinctrl handle for the device that requests configuratio
 826 * @state: the state handle to select/activate/program
 827 */
 828int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
 829{
 830        int ret;
 831
 832        mutex_lock(&pinctrl_mutex);
 833        ret = pinctrl_select_state_locked(p, state);
 834        mutex_unlock(&pinctrl_mutex);
 835
 836        return ret;
 837}
 838EXPORT_SYMBOL_GPL(pinctrl_select_state);
 839
 840static void devm_pinctrl_release(struct device *dev, void *res)
 841{
 842        pinctrl_put(*(struct pinctrl **)res);
 843}
 844
 845/**
 846 * struct devm_pinctrl_get() - Resource managed pinctrl_get()
 847 * @dev: the device to obtain the handle for
 848 *
 849 * If there is a need to explicitly destroy the returned struct pinctrl,
 850 * devm_pinctrl_put() should be used, rather than plain pinctrl_put().
 851 */
 852struct pinctrl *devm_pinctrl_get(struct device *dev)
 853{
 854        struct pinctrl **ptr, *p;
 855
 856        ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL);
 857        if (!ptr)
 858                return ERR_PTR(-ENOMEM);
 859
 860        p = pinctrl_get(dev);
 861        if (!IS_ERR(p)) {
 862                *ptr = p;
 863                devres_add(dev, ptr);
 864        } else {
 865                devres_free(ptr);
 866        }
 867
 868        return p;
 869}
 870EXPORT_SYMBOL_GPL(devm_pinctrl_get);
 871
 872static int devm_pinctrl_match(struct device *dev, void *res, void *data)
 873{
 874        struct pinctrl **p = res;
 875
 876        return *p == data;
 877}
 878
 879/**
 880 * devm_pinctrl_put() - Resource managed pinctrl_put()
 881 * @p: the pinctrl handle to release
 882 *
 883 * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally
 884 * this function will not need to be called and the resource management
 885 * code will ensure that the resource is freed.
 886 */
 887void devm_pinctrl_put(struct pinctrl *p)
 888{
 889        WARN_ON(devres_destroy(p->dev, devm_pinctrl_release,
 890                               devm_pinctrl_match, p));
 891        pinctrl_put(p);
 892}
 893EXPORT_SYMBOL_GPL(devm_pinctrl_put);
 894
 895int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,
 896                         bool dup, bool locked)
 897{
 898        int i, ret;
 899        struct pinctrl_maps *maps_node;
 900
 901        pr_debug("add %d pinmux maps\n", num_maps);
 902
 903        /* First sanity check the new mapping */
 904        for (i = 0; i < num_maps; i++) {
 905                if (!maps[i].dev_name) {
 906                        pr_err("failed to register map %s (%d): no device given\n",
 907                               maps[i].name, i);
 908                        return -EINVAL;
 909                }
 910
 911                if (!maps[i].name) {
 912                        pr_err("failed to register map %d: no map name given\n",
 913                               i);
 914                        return -EINVAL;
 915                }
 916
 917                if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE &&
 918                                !maps[i].ctrl_dev_name) {
 919                        pr_err("failed to register map %s (%d): no pin control device given\n",
 920                               maps[i].name, i);
 921                        return -EINVAL;
 922                }
 923
 924                switch (maps[i].type) {
 925                case PIN_MAP_TYPE_DUMMY_STATE:
 926                        break;
 927                case PIN_MAP_TYPE_MUX_GROUP:
 928                        ret = pinmux_validate_map(&maps[i], i);
 929                        if (ret < 0)
 930                                return ret;
 931                        break;
 932                case PIN_MAP_TYPE_CONFIGS_PIN:
 933                case PIN_MAP_TYPE_CONFIGS_GROUP:
 934                        ret = pinconf_validate_map(&maps[i], i);
 935                        if (ret < 0)
 936                                return ret;
 937                        break;
 938                default:
 939                        pr_err("failed to register map %s (%d): invalid type given\n",
 940                               maps[i].name, i);
 941                        return -EINVAL;
 942                }
 943        }
 944
 945        maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL);
 946        if (!maps_node) {
 947                pr_err("failed to alloc struct pinctrl_maps\n");
 948                return -ENOMEM;
 949        }
 950
 951        maps_node->num_maps = num_maps;
 952        if (dup) {
 953                maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps,
 954                                          GFP_KERNEL);
 955                if (!maps_node->maps) {
 956                        pr_err("failed to duplicate mapping table\n");
 957                        kfree(maps_node);
 958                        return -ENOMEM;
 959                }
 960        } else {
 961                maps_node->maps = maps;
 962        }
 963
 964        if (!locked)
 965                mutex_lock(&pinctrl_mutex);
 966        list_add_tail(&maps_node->node, &pinctrl_maps);
 967        if (!locked)
 968                mutex_unlock(&pinctrl_mutex);
 969
 970        return 0;
 971}
 972
 973/**
 974 * pinctrl_register_mappings() - register a set of pin controller mappings
 975 * @maps: the pincontrol mappings table to register. This should probably be
 976 *      marked with __initdata so it can be discarded after boot. This
 977 *      function will perform a shallow copy for the mapping entries.
 978 * @num_maps: the number of maps in the mapping table
 979 */
 980int pinctrl_register_mappings(struct pinctrl_map const *maps,
 981                              unsigned num_maps)
 982{
 983        return pinctrl_register_map(maps, num_maps, true, false);
 984}
 985
 986void pinctrl_unregister_map(struct pinctrl_map const *map)
 987{
 988        struct pinctrl_maps *maps_node;
 989
 990        list_for_each_entry(maps_node, &pinctrl_maps, node) {
 991                if (maps_node->maps == map) {
 992                        list_del(&maps_node->node);
 993                        return;
 994                }
 995        }
 996}
 997
 998#ifdef CONFIG_DEBUG_FS
 999
1000static int pinctrl_pins_show(struct seq_file *s, void *what)
1001{
1002        struct pinctrl_dev *pctldev = s->private;
1003        const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1004        unsigned i, pin;
1005
1006        seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
1007
1008        mutex_lock(&pinctrl_mutex);
1009
1010        /* The pin number can be retrived from the pin controller descriptor */
1011        for (i = 0; i < pctldev->desc->npins; i++) {
1012                struct pin_desc *desc;
1013
1014                pin = pctldev->desc->pins[i].number;
1015                desc = pin_desc_get(pctldev, pin);
1016                /* Pin space may be sparse */
1017                if (desc == NULL)
1018                        continue;
1019
1020                seq_printf(s, "pin %d (%s) ", pin,
1021                           desc->name ? desc->name : "unnamed");
1022
1023                /* Driver-specific info per pin */
1024                if (ops->pin_dbg_show)
1025                        ops->pin_dbg_show(pctldev, s, pin);
1026
1027                seq_puts(s, "\n");
1028        }
1029
1030        mutex_unlock(&pinctrl_mutex);
1031
1032        return 0;
1033}
1034
1035static int pinctrl_groups_show(struct seq_file *s, void *what)
1036{
1037        struct pinctrl_dev *pctldev = s->private;
1038        const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1039        unsigned ngroups, selector = 0;
1040
1041        ngroups = ops->get_groups_count(pctldev);
1042        mutex_lock(&pinctrl_mutex);
1043
1044        seq_puts(s, "registered pin groups:\n");
1045        while (selector < ngroups) {
1046                const unsigned *pins;
1047                unsigned num_pins;
1048                const char *gname = ops->get_group_name(pctldev, selector);
1049                const char *pname;
1050                int ret;
1051                int i;
1052
1053                ret = ops->get_group_pins(pctldev, selector,
1054                                          &pins, &num_pins);
1055                if (ret)
1056                        seq_printf(s, "%s [ERROR GETTING PINS]\n",
1057                                   gname);
1058                else {
1059                        seq_printf(s, "group: %s\n", gname);
1060                        for (i = 0; i < num_pins; i++) {
1061                                pname = pin_get_name(pctldev, pins[i]);
1062                                if (WARN_ON(!pname))
1063                                        return -EINVAL;
1064                                seq_printf(s, "pin %d (%s)\n", pins[i], pname);
1065                        }
1066                        seq_puts(s, "\n");
1067                }
1068                selector++;
1069        }
1070
1071        mutex_unlock(&pinctrl_mutex);
1072
1073        return 0;
1074}
1075
1076static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
1077{
1078        struct pinctrl_dev *pctldev = s->private;
1079        struct pinctrl_gpio_range *range = NULL;
1080
1081        seq_puts(s, "GPIO ranges handled:\n");
1082
1083        mutex_lock(&pinctrl_mutex);
1084
1085        /* Loop over the ranges */
1086        list_for_each_entry(range, &pctldev->gpio_ranges, node) {
1087                seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
1088                           range->id, range->name,
1089                           range->base, (range->base + range->npins - 1),
1090                           range->pin_base,
1091                           (range->pin_base + range->npins - 1));
1092        }
1093
1094        mutex_unlock(&pinctrl_mutex);
1095
1096        return 0;
1097}
1098
1099static int pinctrl_devices_show(struct seq_file *s, void *what)
1100{
1101        struct pinctrl_dev *pctldev;
1102
1103        seq_puts(s, "name [pinmux] [pinconf]\n");
1104
1105        mutex_lock(&pinctrl_mutex);
1106
1107        list_for_each_entry(pctldev, &pinctrldev_list, node) {
1108                seq_printf(s, "%s ", pctldev->desc->name);
1109                if (pctldev->desc->pmxops)
1110                        seq_puts(s, "yes ");
1111                else
1112                        seq_puts(s, "no ");
1113                if (pctldev->desc->confops)
1114                        seq_puts(s, "yes");
1115                else
1116                        seq_puts(s, "no");
1117                seq_puts(s, "\n");
1118        }
1119
1120        mutex_unlock(&pinctrl_mutex);
1121
1122        return 0;
1123}
1124
1125static inline const char *map_type(enum pinctrl_map_type type)
1126{
1127        static const char * const names[] = {
1128                "INVALID",
1129                "DUMMY_STATE",
1130                "MUX_GROUP",
1131                "CONFIGS_PIN",
1132                "CONFIGS_GROUP",
1133        };
1134
1135        if (type >= ARRAY_SIZE(names))
1136                return "UNKNOWN";
1137
1138        return names[type];
1139}
1140
1141static int pinctrl_maps_show(struct seq_file *s, void *what)
1142{
1143        struct pinctrl_maps *maps_node;
1144        int i;
1145        struct pinctrl_map const *map;
1146
1147        seq_puts(s, "Pinctrl maps:\n");
1148
1149        mutex_lock(&pinctrl_mutex);
1150
1151        for_each_maps(maps_node, i, map) {
1152                seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n",
1153                           map->dev_name, map->name, map_type(map->type),
1154                           map->type);
1155
1156                if (map->type != PIN_MAP_TYPE_DUMMY_STATE)
1157                        seq_printf(s, "controlling device %s\n",
1158                                   map->ctrl_dev_name);
1159
1160                switch (map->type) {
1161                case PIN_MAP_TYPE_MUX_GROUP:
1162                        pinmux_show_map(s, map);
1163                        break;
1164                case PIN_MAP_TYPE_CONFIGS_PIN:
1165                case PIN_MAP_TYPE_CONFIGS_GROUP:
1166                        pinconf_show_map(s, map);
1167                        break;
1168                default:
1169                        break;
1170                }
1171
1172                seq_printf(s, "\n");
1173        }
1174
1175        mutex_unlock(&pinctrl_mutex);
1176
1177        return 0;
1178}
1179
1180static int pinctrl_show(struct seq_file *s, void *what)
1181{
1182        struct pinctrl *p;
1183        struct pinctrl_state *state;
1184        struct pinctrl_setting *setting;
1185
1186        seq_puts(s, "Requested pin control handlers their pinmux maps:\n");
1187
1188        mutex_lock(&pinctrl_mutex);
1189
1190        list_for_each_entry(p, &pinctrl_list, node) {
1191                seq_printf(s, "device: %s current state: %s\n",
1192                           dev_name(p->dev),
1193                           p->state ? p->state->name : "none");
1194
1195                list_for_each_entry(state, &p->states, node) {
1196                        seq_printf(s, "  state: %s\n", state->name);
1197
1198                        list_for_each_entry(setting, &state->settings, node) {
1199                                struct pinctrl_dev *pctldev = setting->pctldev;
1200
1201                                seq_printf(s, "    type: %s controller %s ",
1202                                           map_type(setting->type),
1203                                           pinctrl_dev_get_name(pctldev));
1204
1205                                switch (setting->type) {
1206                                case PIN_MAP_TYPE_MUX_GROUP:
1207                                        pinmux_show_setting(s, setting);
1208                                        break;
1209                                case PIN_MAP_TYPE_CONFIGS_PIN:
1210                                case PIN_MAP_TYPE_CONFIGS_GROUP:
1211                                        pinconf_show_setting(s, setting);
1212                                        break;
1213                                default:
1214                                        break;
1215                                }
1216                        }
1217                }
1218        }
1219
1220        mutex_unlock(&pinctrl_mutex);
1221
1222        return 0;
1223}
1224
1225static int pinctrl_pins_open(struct inode *inode, struct file *file)
1226{
1227        return single_open(file, pinctrl_pins_show, inode->i_private);
1228}
1229
1230static int pinctrl_groups_open(struct inode *inode, struct file *file)
1231{
1232        return single_open(file, pinctrl_groups_show, inode->i_private);
1233}
1234
1235static int pinctrl_gpioranges_open(struct inode *inode, struct file *file)
1236{
1237        return single_open(file, pinctrl_gpioranges_show, inode->i_private);
1238}
1239
1240static int pinctrl_devices_open(struct inode *inode, struct file *file)
1241{
1242        return single_open(file, pinctrl_devices_show, NULL);
1243}
1244
1245static int pinctrl_maps_open(struct inode *inode, struct file *file)
1246{
1247        return single_open(file, pinctrl_maps_show, NULL);
1248}
1249
1250static int pinctrl_open(struct inode *inode, struct file *file)
1251{
1252        return single_open(file, pinctrl_show, NULL);
1253}
1254
1255static const struct file_operations pinctrl_pins_ops = {
1256        .open           = pinctrl_pins_open,
1257        .read           = seq_read,
1258        .llseek         = seq_lseek,
1259        .release        = single_release,
1260};
1261
1262static const struct file_operations pinctrl_groups_ops = {
1263        .open           = pinctrl_groups_open,
1264        .read           = seq_read,
1265        .llseek         = seq_lseek,
1266        .release        = single_release,
1267};
1268
1269static const struct file_operations pinctrl_gpioranges_ops = {
1270        .open           = pinctrl_gpioranges_open,
1271        .read           = seq_read,
1272        .llseek         = seq_lseek,
1273        .release        = single_release,
1274};
1275
1276static const struct file_operations pinctrl_devices_ops = {
1277        .open           = pinctrl_devices_open,
1278        .read           = seq_read,
1279        .llseek         = seq_lseek,
1280        .release        = single_release,
1281};
1282
1283static const struct file_operations pinctrl_maps_ops = {
1284        .open           = pinctrl_maps_open,
1285        .read           = seq_read,
1286        .llseek         = seq_lseek,
1287        .release        = single_release,
1288};
1289
1290static const struct file_operations pinctrl_ops = {
1291        .open           = pinctrl_open,
1292        .read           = seq_read,
1293        .llseek         = seq_lseek,
1294        .release        = single_release,
1295};
1296
1297static struct dentry *debugfs_root;
1298
1299static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1300{
1301        struct dentry *device_root;
1302
1303        device_root = debugfs_create_dir(dev_name(pctldev->dev),
1304                                         debugfs_root);
1305        pctldev->device_root = device_root;
1306
1307        if (IS_ERR(device_root) || !device_root) {
1308                pr_warn("failed to create debugfs directory for %s\n",
1309                        dev_name(pctldev->dev));
1310                return;
1311        }
1312        debugfs_create_file("pins", S_IFREG | S_IRUGO,
1313                            device_root, pctldev, &pinctrl_pins_ops);
1314        debugfs_create_file("pingroups", S_IFREG | S_IRUGO,
1315                            device_root, pctldev, &pinctrl_groups_ops);
1316        debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO,
1317                            device_root, pctldev, &pinctrl_gpioranges_ops);
1318        pinmux_init_device_debugfs(device_root, pctldev);
1319        pinconf_init_device_debugfs(device_root, pctldev);
1320}
1321
1322static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1323{
1324        debugfs_remove_recursive(pctldev->device_root);
1325}
1326
1327static void pinctrl_init_debugfs(void)
1328{
1329        debugfs_root = debugfs_create_dir("pinctrl", NULL);
1330        if (IS_ERR(debugfs_root) || !debugfs_root) {
1331                pr_warn("failed to create debugfs directory\n");
1332                debugfs_root = NULL;
1333                return;
1334        }
1335
1336        debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO,
1337                            debugfs_root, NULL, &pinctrl_devices_ops);
1338        debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO,
1339                            debugfs_root, NULL, &pinctrl_maps_ops);
1340        debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO,
1341                            debugfs_root, NULL, &pinctrl_ops);
1342}
1343
1344#else /* CONFIG_DEBUG_FS */
1345
1346static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1347{
1348}
1349
1350static void pinctrl_init_debugfs(void)
1351{
1352}
1353
1354static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1355{
1356}
1357
1358#endif
1359
1360static int pinctrl_check_ops(struct pinctrl_dev *pctldev)
1361{
1362        const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1363
1364        if (!ops ||
1365            !ops->get_groups_count ||
1366            !ops->get_group_name ||
1367            !ops->get_group_pins)
1368                return -EINVAL;
1369
1370        if (ops->dt_node_to_map && !ops->dt_free_map)
1371                return -EINVAL;
1372
1373        return 0;
1374}
1375
1376/**
1377 * pinctrl_register() - register a pin controller device
1378 * @pctldesc: descriptor for this pin controller
1379 * @dev: parent device for this pin controller
1380 * @driver_data: private pin controller data for this pin controller
1381 */
1382struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
1383                                    struct device *dev, void *driver_data)
1384{
1385        struct pinctrl_dev *pctldev;
1386        int ret;
1387
1388        if (!pctldesc)
1389                return NULL;
1390        if (!pctldesc->name)
1391                return NULL;
1392
1393        pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL);
1394        if (pctldev == NULL) {
1395                dev_err(dev, "failed to alloc struct pinctrl_dev\n");
1396                return NULL;
1397        }
1398
1399        /* Initialize pin control device struct */
1400        pctldev->owner = pctldesc->owner;
1401        pctldev->desc = pctldesc;
1402        pctldev->driver_data = driver_data;
1403        INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
1404        INIT_LIST_HEAD(&pctldev->gpio_ranges);
1405        pctldev->dev = dev;
1406
1407        /* check core ops for sanity */
1408        if (pinctrl_check_ops(pctldev)) {
1409                dev_err(dev, "pinctrl ops lacks necessary functions\n");
1410                goto out_err;
1411        }
1412
1413        /* If we're implementing pinmuxing, check the ops for sanity */
1414        if (pctldesc->pmxops) {
1415                if (pinmux_check_ops(pctldev))
1416                        goto out_err;
1417        }
1418
1419        /* If we're implementing pinconfig, check the ops for sanity */
1420        if (pctldesc->confops) {
1421                if (pinconf_check_ops(pctldev))
1422                        goto out_err;
1423        }
1424
1425        /* Register all the pins */
1426        dev_dbg(dev, "try to register %d pins ...\n",  pctldesc->npins);
1427        ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins);
1428        if (ret) {
1429                dev_err(dev, "error during pin registration\n");
1430                pinctrl_free_pindescs(pctldev, pctldesc->pins,
1431                                      pctldesc->npins);
1432                goto out_err;
1433        }
1434
1435        mutex_lock(&pinctrl_mutex);
1436
1437        list_add_tail(&pctldev->node, &pinctrldev_list);
1438
1439        pctldev->p = pinctrl_get_locked(pctldev->dev);
1440        if (!IS_ERR(pctldev->p)) {
1441                struct pinctrl_state *s =
1442                        pinctrl_lookup_state_locked(pctldev->p,
1443                                                    PINCTRL_STATE_DEFAULT);
1444                if (IS_ERR(s)) {
1445                        dev_dbg(dev, "failed to lookup the default state\n");
1446                } else {
1447                        if (pinctrl_select_state_locked(pctldev->p, s))
1448                                dev_err(dev,
1449                                        "failed to select default state\n");
1450                }
1451        }
1452
1453        mutex_unlock(&pinctrl_mutex);
1454
1455        pinctrl_init_device_debugfs(pctldev);
1456
1457        return pctldev;
1458
1459out_err:
1460        kfree(pctldev);
1461        return NULL;
1462}
1463EXPORT_SYMBOL_GPL(pinctrl_register);
1464
1465/**
1466 * pinctrl_unregister() - unregister pinmux
1467 * @pctldev: pin controller to unregister
1468 *
1469 * Called by pinmux drivers to unregister a pinmux.
1470 */
1471void pinctrl_unregister(struct pinctrl_dev *pctldev)
1472{
1473        struct pinctrl_gpio_range *range, *n;
1474        if (pctldev == NULL)
1475                return;
1476
1477        pinctrl_remove_device_debugfs(pctldev);
1478
1479        mutex_lock(&pinctrl_mutex);
1480
1481        if (!IS_ERR(pctldev->p))
1482                pinctrl_put_locked(pctldev->p, true);
1483
1484        /* TODO: check that no pinmuxes are still active? */
1485        list_del(&pctldev->node);
1486        /* Destroy descriptor tree */
1487        pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
1488                              pctldev->desc->npins);
1489        /* remove gpio ranges map */
1490        list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node)
1491                list_del(&range->node);
1492
1493        kfree(pctldev);
1494
1495        mutex_unlock(&pinctrl_mutex);
1496}
1497EXPORT_SYMBOL_GPL(pinctrl_unregister);
1498
1499static int __init pinctrl_init(void)
1500{
1501        pr_info("initialized pinctrl subsystem\n");
1502        pinctrl_init_debugfs();
1503        return 0;
1504}
1505
1506/* init early since many drivers really need to initialized pinmux early */
1507core_initcall(pinctrl_init);
1508
lxr.linux.no kindly hosted by Redpill Linpro AS, provider of Linux consulting and operations services since 1995.