drivers/pinctrl/pinmux.c

   1 /*
   2  * Core driver for the pin muxing portions of 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) "pinmux core: " fmt
  15
  16 #include <linux/kernel.h>
  17 #include <linux/module.h>
  18 #include <linux/init.h>
  19 #include <linux/device.h>
  20 #include <linux/slab.h>
  21 #include <linux/radix-tree.h>
  22 #include <linux/err.h>
  23 #include <linux/list.h>
  24 #include <linux/string.h>
  25 #include <linux/sysfs.h>
  26 #include <linux/debugfs.h>
  27 #include <linux/seq_file.h>
  28 #include <linux/pinctrl/machine.h>
  29 #include <linux/pinctrl/pinmux.h>
  30 #include "core.h"
  31 #include "pinmux.h"
  32
  33 int pinmux_check_ops(struct pinctrl_dev *pctldev)
  34 {
  35         const struct pinmux_ops *ops = pctldev->desc->pmxops;
  36         unsigned nfuncs;
  37         unsigned selector = 0;
  38
  39         /* Check that we implement required operations */
  40         if (!ops ||
  41             !ops->get_functions_count ||
  42             !ops->get_function_name ||
  43             !ops->get_function_groups ||
  44             !ops->set_mux) {
  45                 dev_err(pctldev->dev, "pinmux ops lacks necessary functions\n");
  46                 return -EINVAL;
  47         }
  48         /* Check that all functions registered have names */
  49         nfuncs = ops->get_functions_count(pctldev);
  50         while (selector < nfuncs) {
  51                 const char *fname = ops->get_function_name(pctldev,
  52                                                            selector);
  53                 if (!fname) {
  54                         dev_err(pctldev->dev, "pinmux ops has no name for function%u\n",
  55                                 selector);
  56                         return -EINVAL;
  57                 }
  58                 selector++;
  59         }
  60
  61         return 0;
  62 }
  63
  64 int pinmux_validate_map(struct pinctrl_map const *map, int i)
  65 {
  66         if (!map->data.mux.function) {
  67                 pr_err("failed to register map %s (%d): no function given\n",
  68                        map->name, i);
  69                 return -EINVAL;
  70         }
  71
  72         return 0;
  73 }
  74
  75 /**
  76  * pin_request() - request a single pin to be muxed in, typically for GPIO
  77  * @pin: the pin number in the global pin space
  78  * @owner: a representation of the owner of this pin; typically the device
  79  *      name that controls its mux function, or the requested GPIO name
  80  * @gpio_range: the range matching the GPIO pin if this is a request for a
  81  *      single GPIO pin
  82  */
  83 static int pin_request(struct pinctrl_dev *pctldev,
  84                        int pin, const char *owner,
  85                        struct pinctrl_gpio_range *gpio_range)
  86 {
  87         struct pin_desc *desc;
  88         const struct pinmux_ops *ops = pctldev->desc->pmxops;
  89         int status = -EINVAL;
  90
  91         desc = pin_desc_get(pctldev, pin);
  92         if (desc == NULL) {
  93                 dev_err(pctldev->dev,
  94                         "pin %d is not registered so it cannot be requested\n",
  95                         pin);
  96                 goto out;
  97         }
  98
  99         dev_dbg(pctldev->dev, "request pin %d (%s) for %s\n",
 100                 pin, desc->name, owner);
 101
 102         if (gpio_range) {
 103                 /* There's no need to support multiple GPIO requests */
 104                 if (desc->gpio_owner) {
 105                         dev_err(pctldev->dev,
 106                                 "pin %s already requested by %s; cannot claim for %s\n",
 107                                 desc->name, desc->gpio_owner, owner);
 108                         goto out;
 109                 }
 110                 if (ops->strict && desc->mux_usecount &&
 111                     strcmp(desc->mux_owner, owner)) {
 112                         dev_err(pctldev->dev,
 113                                 "pin %s already requested by %s; cannot claim for %s\n",
 114                                 desc->name, desc->mux_owner, owner);
 115                         goto out;
 116                 }
 117
 118                 desc->gpio_owner = owner;
 119         } else {
 120                 if (desc->mux_usecount && strcmp(desc->mux_owner, owner)) {
 121                         dev_err(pctldev->dev,
 122                                 "pin %s already requested by %s; cannot claim for %s\n",
 123                                 desc->name, desc->mux_owner, owner);
 124                         goto out;
 125                 }
 126                 if (ops->strict && desc->gpio_owner) {
 127                         dev_err(pctldev->dev,
 128                                 "pin %s already requested by %s; cannot claim for %s\n",
 129                                 desc->name, desc->gpio_owner, owner);
 130                         goto out;
 131                 }
 132
 133                 desc->mux_usecount++;
 134                 if (desc->mux_usecount > 1)
 135                         return 0;
 136
 137                 desc->mux_owner = owner;
 138         }
 139
 140         /* Let each pin increase references to this module */
 141         if (!try_module_get(pctldev->owner)) {
 142                 dev_err(pctldev->dev,
 143                         "could not increase module refcount for pin %d\n",
 144                         pin);
 145                 status = -EINVAL;
 146                 goto out_free_pin;
 147         }
 148
 149         /*
 150          * If there is no kind of request function for the pin we just assume
 151          * we got it by default and proceed.
 152          */
 153         if (gpio_range && ops->gpio_request_enable)
 154                 /* This requests and enables a single GPIO pin */
 155                 status = ops->gpio_request_enable(pctldev, gpio_range, pin);
 156         else if (ops->request)
 157                 status = ops->request(pctldev, pin);
 158         else
 159                 status = 0;
 160
 161         if (status) {
 162                 dev_err(pctldev->dev, "request() failed for pin %d\n", pin);
 163                 module_put(pctldev->owner);
 164         }
 165
 166 out_free_pin:
 167         if (status) {
 168                 if (gpio_range) {
 169                         desc->gpio_owner = NULL;
 170                 } else {
 171                         desc->mux_usecount--;
 172                         if (!desc->mux_usecount)
 173                                 desc->mux_owner = NULL;
 174                 }
 175         }
 176 out:
 177         if (status)
 178                 dev_err(pctldev->dev, "pin-%d (%s) status %d\n",
 179                         pin, owner, status);
 180
 181         return status;
 182 }
 183
 184 /**
 185  * pin_free() - release a single muxed in pin so something else can be muxed
 186  * @pctldev: pin controller device handling this pin
 187  * @pin: the pin to free
 188  * @gpio_range: the range matching the GPIO pin if this is a request for a
 189  *      single GPIO pin
 190  *
 191  * This function returns a pointer to the previous owner. This is used
 192  * for callers that dynamically allocate an owner name so it can be freed
 193  * once the pin is free. This is done for GPIO request functions.
 194  */
 195 static const char *pin_free(struct pinctrl_dev *pctldev, int pin,
 196                             struct pinctrl_gpio_range *gpio_range)
 197 {
 198         const struct pinmux_ops *ops = pctldev->desc->pmxops;
 199         struct pin_desc *desc;
 200         const char *owner;
 201
 202         desc = pin_desc_get(pctldev, pin);
 203         if (desc == NULL) {
 204                 dev_err(pctldev->dev,
 205                         "pin is not registered so it cannot be freed\n");
 206                 return NULL;
 207         }
 208
 209         if (!gpio_range) {
 210                 /*
 211                  * A pin should not be freed more times than allocated.
 212                  */
 213                 if (WARN_ON(!desc->mux_usecount))
 214                         return NULL;
 215                 desc->mux_usecount--;
 216                 if (desc->mux_usecount)
 217                         return NULL;
 218         }
 219
 220         /*
 221          * If there is no kind of request function for the pin we just assume
 222          * we got it by default and proceed.
 223          */
 224         if (gpio_range && ops->gpio_disable_free)
 225                 ops->gpio_disable_free(pctldev, gpio_range, pin);
 226         else if (ops->free)
 227                 ops->free(pctldev, pin);
 228
 229         if (gpio_range) {
 230                 owner = desc->gpio_owner;
 231                 desc->gpio_owner = NULL;
 232         } else {
 233                 owner = desc->mux_owner;
 234                 desc->mux_owner = NULL;
 235                 desc->mux_setting = NULL;
 236         }
 237
 238         module_put(pctldev->owner);
 239
 240         return owner;
 241 }
 242
 243 /**
 244  * pinmux_request_gpio() - request pinmuxing for a GPIO pin
 245  * @pctldev: pin controller device affected
 246  * @pin: the pin to mux in for GPIO
 247  * @range: the applicable GPIO range
 248  */
 249 int pinmux_request_gpio(struct pinctrl_dev *pctldev,
 250                         struct pinctrl_gpio_range *range,
 251                         unsigned pin, unsigned gpio)
 252 {
 253         const char *owner;
 254         int ret;
 255
 256         /* Conjure some name stating what chip and pin this is taken by */
 257         owner = kasprintf(GFP_KERNEL, "%s:%d", range->name, gpio);
 258         if (!owner)
 259                 return -EINVAL;
 260
 261         ret = pin_request(pctldev, pin, owner, range);
 262         if (ret < 0)
 263                 kfree(owner);
 264
 265         return ret;
 266 }
 267
 268 /**
 269  * pinmux_free_gpio() - release a pin from GPIO muxing
 270  * @pctldev: the pin controller device for the pin
 271  * @pin: the affected currently GPIO-muxed in pin
 272  * @range: applicable GPIO range
 273  */
 274 void pinmux_free_gpio(struct pinctrl_dev *pctldev, unsigned pin,
 275                       struct pinctrl_gpio_range *range)
 276 {
 277         const char *owner;
 278
 279         owner = pin_free(pctldev, pin, range);
 280         kfree(owner);
 281 }
 282
 283 /**
 284  * pinmux_gpio_direction() - set the direction of a single muxed-in GPIO pin
 285  * @pctldev: the pin controller handling this pin
 286  * @range: applicable GPIO range
 287  * @pin: the affected GPIO pin in this controller
 288  * @input: true if we set the pin as input, false for output
 289  */
 290 int pinmux_gpio_direction(struct pinctrl_dev *pctldev,
 291                           struct pinctrl_gpio_range *range,
 292                           unsigned pin, bool input)
 293 {
 294         const struct pinmux_ops *ops;
 295         int ret;
 296
 297         ops = pctldev->desc->pmxops;
 298
 299         if (ops->gpio_set_direction)
 300                 ret = ops->gpio_set_direction(pctldev, range, pin, input);
 301         else
 302                 ret = 0;
 303
 304         return ret;
 305 }
 306
 307 static int pinmux_func_name_to_selector(struct pinctrl_dev *pctldev,
 308                                         const char *function)
 309 {
 310         const struct pinmux_ops *ops = pctldev->desc->pmxops;
 311         unsigned nfuncs = ops->get_functions_count(pctldev);
 312         unsigned selector = 0;
 313
 314         /* See if this pctldev has this function */
 315         while (selector < nfuncs) {
 316                 const char *fname = ops->get_function_name(pctldev,
 317                                                            selector);
 318
 319                 if (!strcmp(function, fname))
 320                         return selector;
 321
 322                 selector++;
 323         }
 324
 325         pr_err("%s does not support function %s\n",
 326                pinctrl_dev_get_name(pctldev), function);
 327         return -EINVAL;
 328 }
 329
 330 int pinmux_map_to_setting(struct pinctrl_map const *map,
 331                           struct pinctrl_setting *setting)
 332 {
 333         struct pinctrl_dev *pctldev = setting->pctldev;
 334         const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
 335         char const * const *groups;
 336         unsigned num_groups;
 337         int ret;
 338         const char *group;
 339         int i;
 340
 341         if (!pmxops) {
 342                 dev_err(pctldev->dev, "does not support mux function\n");
 343                 return -EINVAL;
 344         }
 345
 346         ret = pinmux_func_name_to_selector(pctldev, map->data.mux.function);
 347         if (ret < 0) {
 348                 dev_err(pctldev->dev, "invalid function %s in map table\n",
 349                         map->data.mux.function);
 350                 return ret;
 351         }
 352         setting->data.mux.func = ret;
 353
 354         ret = pmxops->get_function_groups(pctldev, setting->data.mux.func,
 355                                           &groups, &num_groups);
 356         if (ret < 0) {
 357                 dev_err(pctldev->dev, "can't query groups for function %s\n",
 358                         map->data.mux.function);
 359                 return ret;
 360         }
 361         if (!num_groups) {
 362                 dev_err(pctldev->dev,
 363                         "function %s can't be selected on any group\n",
 364                         map->data.mux.function);
 365                 return -EINVAL;
 366         }
 367         if (map->data.mux.group) {
 368                 bool found = false;
 369                 group = map->data.mux.group;
 370                 for (i = 0; i < num_groups; i++) {
 371                         if (!strcmp(group, groups[i])) {
 372                                 found = true;
 373                                 break;
 374                         }
 375                 }
 376                 if (!found) {
 377                         dev_err(pctldev->dev,
 378                                 "invalid group \"%s\" for function \"%s\"\n",
 379                                 group, map->data.mux.function);
 380                         return -EINVAL;
 381                 }
 382         } else {
 383                 group = groups[0];
 384         }
 385
 386         ret = pinctrl_get_group_selector(pctldev, group);
 387         if (ret < 0) {
 388                 dev_err(pctldev->dev, "invalid group %s in map table\n",
 389                         map->data.mux.group);
 390                 return ret;
 391         }
 392         setting->data.mux.group = ret;
 393
 394         return 0;
 395 }
 396
 397 void pinmux_free_setting(struct pinctrl_setting const *setting)
 398 {
 399         /* This function is currently unused */
 400 }
 401
 402 int pinmux_enable_setting(struct pinctrl_setting const *setting)
 403 {
 404         struct pinctrl_dev *pctldev = setting->pctldev;
 405         const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 406         const struct pinmux_ops *ops = pctldev->desc->pmxops;
 407         int ret = 0;
 408         const unsigned *pins = NULL;
 409         unsigned num_pins = 0;
 410         int i;
 411         struct pin_desc *desc;
 412
 413         if (pctlops->get_group_pins)
 414                 ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
 415                                               &pins, &num_pins);
 416
 417         if (ret) {
 418                 const char *gname;
 419
 420                 /* errors only affect debug data, so just warn */
 421                 gname = pctlops->get_group_name(pctldev,
 422                                                 setting->data.mux.group);
 423                 dev_warn(pctldev->dev,
 424                          "could not get pins for group %s\n",
 425                          gname);
 426                 num_pins = 0;
 427         }
 428
 429         /* Try to allocate all pins in this group, one by one */
 430         for (i = 0; i < num_pins; i++) {
 431                 ret = pin_request(pctldev, pins[i], setting->dev_name, NULL);
 432                 if (ret) {
 433                         const char *gname;
 434                         const char *pname;
 435
 436                         desc = pin_desc_get(pctldev, pins[i]);
 437                         pname = desc ? desc->name : "non-existing";
 438                         gname = pctlops->get_group_name(pctldev,
 439                                                 setting->data.mux.group);
 440                         dev_err(pctldev->dev,
 441                                 "could not request pin %d (%s) from group %s "
 442                                 " on device %s\n",
 443                                 pins[i], pname, gname,
 444                                 pinctrl_dev_get_name(pctldev));
 445                         goto err_pin_request;
 446                 }
 447         }
 448
 449         /* Now that we have acquired the pins, encode the mux setting */
 450         for (i = 0; i < num_pins; i++) {
 451                 desc = pin_desc_get(pctldev, pins[i]);
 452                 if (desc == NULL) {
 453                         dev_warn(pctldev->dev,
 454                                  "could not get pin desc for pin %d\n",
 455                                  pins[i]);
 456                         continue;
 457                 }
 458                 desc->mux_setting = &(setting->data.mux);
 459         }
 460
 461         ret = ops->set_mux(pctldev, setting->data.mux.func,
 462                            setting->data.mux.group);
 463
 464         if (ret)
 465                 goto err_set_mux;
 466
 467         return 0;
 468
 469 err_set_mux:
 470         for (i = 0; i < num_pins; i++) {
 471                 desc = pin_desc_get(pctldev, pins[i]);
 472                 if (desc)
 473                         desc->mux_setting = NULL;
 474         }
 475 err_pin_request:
 476         /* On error release all taken pins */
 477         while (--i >= 0)
 478                 pin_free(pctldev, pins[i], NULL);
 479
 480         return ret;
 481 }
 482
 483 void pinmux_disable_setting(struct pinctrl_setting const *setting)
 484 {
 485         struct pinctrl_dev *pctldev = setting->pctldev;
 486         const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 487         int ret = 0;
 488         const unsigned *pins = NULL;
 489         unsigned num_pins = 0;
 490         int i;
 491         struct pin_desc *desc;
 492
 493         if (pctlops->get_group_pins)
 494                 ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
 495                                               &pins, &num_pins);
 496         if (ret) {
 497                 const char *gname;
 498
 499                 /* errors only affect debug data, so just warn */
 500                 gname = pctlops->get_group_name(pctldev,
 501                                                 setting->data.mux.group);
 502                 dev_warn(pctldev->dev,
 503                          "could not get pins for group %s\n",
 504                          gname);
 505                 num_pins = 0;
 506         }
 507
 508         /* Flag the descs that no setting is active */
 509         for (i = 0; i < num_pins; i++) {
 510                 desc = pin_desc_get(pctldev, pins[i]);
 511                 if (desc == NULL) {
 512                         dev_warn(pctldev->dev,
 513                                  "could not get pin desc for pin %d\n",
 514                                  pins[i]);
 515                         continue;
 516                 }
 517                 if (desc->mux_setting == &(setting->data.mux)) {
 518                         desc->mux_setting = NULL;
 519                         /* And release the pin */
 520                         pin_free(pctldev, pins[i], NULL);
 521                 } else {
 522                         const char *gname;
 523
 524                         gname = pctlops->get_group_name(pctldev,
 525                                                 setting->data.mux.group);
 526                         dev_warn(pctldev->dev,
 527                                  "not freeing pin %d (%s) as part of "
 528                                  "deactivating group %s - it is already "
 529                                  "used for some other setting",
 530                                  pins[i], desc->name, gname);
 531                 }
 532         }
 533 }
 534
 535 #ifdef CONFIG_DEBUG_FS
 536
 537 /* Called from pincontrol core */
 538 static int pinmux_functions_show(struct seq_file *s, void *what)
 539 {
 540         struct pinctrl_dev *pctldev = s->private;
 541         const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
 542         unsigned nfuncs;
 543         unsigned func_selector = 0;
 544
 545         if (!pmxops)
 546                 return 0;
 547
 548         mutex_lock(&pctldev->mutex);
 549         nfuncs = pmxops->get_functions_count(pctldev);
 550         while (func_selector < nfuncs) {
 551                 const char *func = pmxops->get_function_name(pctldev,
 552                                                           func_selector);
 553                 const char * const *groups;
 554                 unsigned num_groups;
 555                 int ret;
 556                 int i;
 557
 558                 ret = pmxops->get_function_groups(pctldev, func_selector,
 559                                                   &groups, &num_groups);
 560                 if (ret) {
 561                         seq_printf(s, "function %s: COULD NOT GET GROUPS\n",
 562                                    func);
 563                         func_selector++;
 564                         continue;
 565                 }
 566
 567                 seq_printf(s, "function: %s, groups = [ ", func);
 568                 for (i = 0; i < num_groups; i++)
 569                         seq_printf(s, "%s ", groups[i]);
 570                 seq_puts(s, "]\n");
 571
 572                 func_selector++;
 573         }
 574
 575         mutex_unlock(&pctldev->mutex);
 576
 577         return 0;
 578 }
 579
 580 static int pinmux_pins_show(struct seq_file *s, void *what)
 581 {
 582         struct pinctrl_dev *pctldev = s->private;
 583         const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 584         const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
 585         unsigned i, pin;
 586
 587         if (!pmxops)
 588                 return 0;
 589
 590         seq_puts(s, "Pinmux settings per pin\n");
 591         if (pmxops->strict)
 592                 seq_puts(s,
 593                  "Format: pin (name): mux_owner|gpio_owner (strict) hog?\n");
 594         else
 595                 seq_puts(s,
 596                 "Format: pin (name): mux_owner gpio_owner hog?\n");
 597
 598         mutex_lock(&pctldev->mutex);
 599
 600         /* The pin number can be retrived from the pin controller descriptor */
 601         for (i = 0; i < pctldev->desc->npins; i++) {
 602                 struct pin_desc *desc;
 603                 bool is_hog = false;
 604
 605                 pin = pctldev->desc->pins[i].number;
 606                 desc = pin_desc_get(pctldev, pin);
 607                 /* Skip if we cannot search the pin */
 608                 if (desc == NULL)
 609                         continue;
 610
 611                 if (desc->mux_owner &&
 612                     !strcmp(desc->mux_owner, pinctrl_dev_get_name(pctldev)))
 613                         is_hog = true;
 614
 615                 if (pmxops->strict) {
 616                         if (desc->mux_owner)
 617                                 seq_printf(s, "pin %d (%s): device %s%s",
 618                                            pin,
 619                                            desc->name ? desc->name : "unnamed",
 620                                            desc->mux_owner,
 621                                            is_hog ? " (HOG)" : "");
 622                         else if (desc->gpio_owner)
 623                                 seq_printf(s, "pin %d (%s): GPIO %s",
 624                                            pin,
 625                                            desc->name ? desc->name : "unnamed",
 626                                            desc->gpio_owner);
 627                         else
 628                                 seq_printf(s, "pin %d (%s): UNCLAIMED",
 629                                            pin,
 630                                            desc->name ? desc->name : "unnamed");
 631                 } else {
 632                         /* For non-strict controllers */
 633                         seq_printf(s, "pin %d (%s): %s %s%s", pin,
 634                                    desc->name ? desc->name : "unnamed",
 635                                    desc->mux_owner ? desc->mux_owner
 636                                    : "(MUX UNCLAIMED)",
 637                                    desc->gpio_owner ? desc->gpio_owner
 638                                    : "(GPIO UNCLAIMED)",
 639                                    is_hog ? " (HOG)" : "");
 640                 }
 641
 642                 /* If mux: print function+group claiming the pin */
 643                 if (desc->mux_setting)
 644                         seq_printf(s, " function %s group %s\n",
 645                                    pmxops->get_function_name(pctldev,
 646                                         desc->mux_setting->func),
 647                                    pctlops->get_group_name(pctldev,
 648                                         desc->mux_setting->group));
 649                 else
 650                         seq_printf(s, "\n");
 651         }
 652
 653         mutex_unlock(&pctldev->mutex);
 654
 655         return 0;
 656 }
 657
 658 void pinmux_show_map(struct seq_file *s, struct pinctrl_map const *map)
 659 {
 660         seq_printf(s, "group %s\nfunction %s\n",
 661                 map->data.mux.group ? map->data.mux.group : "(default)",
 662                 map->data.mux.function);
 663 }
 664
 665 void pinmux_show_setting(struct seq_file *s,
 666                          struct pinctrl_setting const *setting)
 667 {
 668         struct pinctrl_dev *pctldev = setting->pctldev;
 669         const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
 670         const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 671
 672         seq_printf(s, "group: %s (%u) function: %s (%u)\n",
 673                    pctlops->get_group_name(pctldev, setting->data.mux.group),
 674                    setting->data.mux.group,
 675                    pmxops->get_function_name(pctldev, setting->data.mux.func),
 676                    setting->data.mux.func);
 677 }
 678
 679 static int pinmux_functions_open(struct inode *inode, struct file *file)
 680 {
 681         return single_open(file, pinmux_functions_show, inode->i_private);
 682 }
 683
 684 static int pinmux_pins_open(struct inode *inode, struct file *file)
 685 {
 686         return single_open(file, pinmux_pins_show, inode->i_private);
 687 }
 688
 689 static const struct file_operations pinmux_functions_ops = {
 690         .open           = pinmux_functions_open,
 691         .read           = seq_read,
 692         .llseek         = seq_lseek,
 693         .release        = single_release,
 694 };
 695
 696 static const struct file_operations pinmux_pins_ops = {
 697         .open           = pinmux_pins_open,
 698         .read           = seq_read,
 699         .llseek         = seq_lseek,
 700         .release        = single_release,
 701 };
 702
 703 void pinmux_init_device_debugfs(struct dentry *devroot,
 704                          struct pinctrl_dev *pctldev)
 705 {
 706         debugfs_create_file("pinmux-functions", S_IFREG | S_IRUGO,
 707                             devroot, pctldev, &pinmux_functions_ops);
 708         debugfs_create_file("pinmux-pins", S_IFREG | S_IRUGO,
 709                             devroot, pctldev, &pinmux_pins_ops);
 710 }
 711
 712 #endif /* CONFIG_DEBUG_FS */