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, selector);
 317
 318                 if (!strcmp(function, fname))
 319                         return selector;
 320
 321                 selector++;
 322         }
 323
 324         dev_err(pctldev->dev, "function '%s' not supported\n", function);
 325         return -EINVAL;
 326 }
 327
 328 int pinmux_map_to_setting(struct pinctrl_map const *map,
 329                           struct pinctrl_setting *setting)
 330 {
 331         struct pinctrl_dev *pctldev = setting->pctldev;
 332         const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
 333         char const * const *groups;
 334         unsigned num_groups;
 335         int ret;
 336         const char *group;
 337         int i;
 338
 339         if (!pmxops) {
 340                 dev_err(pctldev->dev, "does not support mux function\n");
 341                 return -EINVAL;
 342         }
 343
 344         ret = pinmux_func_name_to_selector(pctldev, map->data.mux.function);
 345         if (ret < 0) {
 346                 dev_err(pctldev->dev, "invalid function %s in map table\n",
 347                         map->data.mux.function);
 348                 return ret;
 349         }
 350         setting->data.mux.func = ret;
 351
 352         ret = pmxops->get_function_groups(pctldev, setting->data.mux.func,
 353                                           &groups, &num_groups);
 354         if (ret < 0) {
 355                 dev_err(pctldev->dev, "can't query groups for function %s\n",
 356                         map->data.mux.function);
 357                 return ret;
 358         }
 359         if (!num_groups) {
 360                 dev_err(pctldev->dev,
 361                         "function %s can't be selected on any group\n",
 362                         map->data.mux.function);
 363                 return -EINVAL;
 364         }
 365         if (map->data.mux.group) {
 366                 bool found = false;
 367                 group = map->data.mux.group;
 368                 for (i = 0; i < num_groups; i++) {
 369                         if (!strcmp(group, groups[i])) {
 370                                 found = true;
 371                                 break;
 372                         }
 373                 }
 374                 if (!found) {
 375                         dev_err(pctldev->dev,
 376                                 "invalid group \"%s\" for function \"%s\"\n",
 377                                 group, map->data.mux.function);
 378                         return -EINVAL;
 379                 }
 380         } else {
 381                 group = groups[0];
 382         }
 383
 384         ret = pinctrl_get_group_selector(pctldev, group);
 385         if (ret < 0) {
 386                 dev_err(pctldev->dev, "invalid group %s in map table\n",
 387                         map->data.mux.group);
 388                 return ret;
 389         }
 390         setting->data.mux.group = ret;
 391
 392         return 0;
 393 }
 394
 395 void pinmux_free_setting(struct pinctrl_setting const *setting)
 396 {
 397         /* This function is currently unused */
 398 }
 399
 400 int pinmux_enable_setting(struct pinctrl_setting const *setting)
 401 {
 402         struct pinctrl_dev *pctldev = setting->pctldev;
 403         const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 404         const struct pinmux_ops *ops = pctldev->desc->pmxops;
 405         int ret = 0;
 406         const unsigned *pins = NULL;
 407         unsigned num_pins = 0;
 408         int i;
 409         struct pin_desc *desc;
 410
 411         if (pctlops->get_group_pins)
 412                 ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
 413                                               &pins, &num_pins);
 414
 415         if (ret) {
 416                 const char *gname;
 417
 418                 /* errors only affect debug data, so just warn */
 419                 gname = pctlops->get_group_name(pctldev,
 420                                                 setting->data.mux.group);
 421                 dev_warn(pctldev->dev,
 422                          "could not get pins for group %s\n",
 423                          gname);
 424                 num_pins = 0;
 425         }
 426
 427         /* Try to allocate all pins in this group, one by one */
 428         for (i = 0; i < num_pins; i++) {
 429                 ret = pin_request(pctldev, pins[i], setting->dev_name, NULL);
 430                 if (ret) {
 431                         const char *gname;
 432                         const char *pname;
 433
 434                         desc = pin_desc_get(pctldev, pins[i]);
 435                         pname = desc ? desc->name : "non-existing";
 436                         gname = pctlops->get_group_name(pctldev,
 437                                                 setting->data.mux.group);
 438                         dev_err(pctldev->dev,
 439                                 "could not request pin %d (%s) from group %s "
 440                                 " on device %s\n",
 441                                 pins[i], pname, gname,
 442                                 pinctrl_dev_get_name(pctldev));
 443                         goto err_pin_request;
 444                 }
 445         }
 446
 447         /* Now that we have acquired the pins, encode the mux setting */
 448         for (i = 0; i < num_pins; i++) {
 449                 desc = pin_desc_get(pctldev, pins[i]);
 450                 if (desc == NULL) {
 451                         dev_warn(pctldev->dev,
 452                                  "could not get pin desc for pin %d\n",
 453                                  pins[i]);
 454                         continue;
 455                 }
 456                 desc->mux_setting = &(setting->data.mux);
 457         }
 458
 459         ret = ops->set_mux(pctldev, setting->data.mux.func,
 460                            setting->data.mux.group);
 461
 462         if (ret)
 463                 goto err_set_mux;
 464
 465         return 0;
 466
 467 err_set_mux:
 468         for (i = 0; i < num_pins; i++) {
 469                 desc = pin_desc_get(pctldev, pins[i]);
 470                 if (desc)
 471                         desc->mux_setting = NULL;
 472         }
 473 err_pin_request:
 474         /* On error release all taken pins */
 475         while (--i >= 0)
 476                 pin_free(pctldev, pins[i], NULL);
 477
 478         return ret;
 479 }
 480
 481 void pinmux_disable_setting(struct pinctrl_setting const *setting)
 482 {
 483         struct pinctrl_dev *pctldev = setting->pctldev;
 484         const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 485         int ret = 0;
 486         const unsigned *pins = NULL;
 487         unsigned num_pins = 0;
 488         int i;
 489         struct pin_desc *desc;
 490
 491         if (pctlops->get_group_pins)
 492                 ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
 493                                               &pins, &num_pins);
 494         if (ret) {
 495                 const char *gname;
 496
 497                 /* errors only affect debug data, so just warn */
 498                 gname = pctlops->get_group_name(pctldev,
 499                                                 setting->data.mux.group);
 500                 dev_warn(pctldev->dev,
 501                          "could not get pins for group %s\n",
 502                          gname);
 503                 num_pins = 0;
 504         }
 505
 506         /* Flag the descs that no setting is active */
 507         for (i = 0; i < num_pins; i++) {
 508                 desc = pin_desc_get(pctldev, pins[i]);
 509                 if (desc == NULL) {
 510                         dev_warn(pctldev->dev,
 511                                  "could not get pin desc for pin %d\n",
 512                                  pins[i]);
 513                         continue;
 514                 }
 515                 if (desc->mux_setting == &(setting->data.mux)) {
 516                         desc->mux_setting = NULL;
 517                         /* And release the pin */
 518                         pin_free(pctldev, pins[i], NULL);
 519                 } else {
 520                         const char *gname;
 521
 522                         gname = pctlops->get_group_name(pctldev,
 523                                                 setting->data.mux.group);
 524                         dev_warn(pctldev->dev,
 525                                  "not freeing pin %d (%s) as part of "
 526                                  "deactivating group %s - it is already "
 527                                  "used for some other setting",
 528                                  pins[i], desc->name, gname);
 529                 }
 530         }
 531 }
 532
 533 #ifdef CONFIG_DEBUG_FS
 534
 535 /* Called from pincontrol core */
 536 static int pinmux_functions_show(struct seq_file *s, void *what)
 537 {
 538         struct pinctrl_dev *pctldev = s->private;
 539         const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
 540         unsigned nfuncs;
 541         unsigned func_selector = 0;
 542
 543         if (!pmxops)
 544                 return 0;
 545
 546         mutex_lock(&pctldev->mutex);
 547         nfuncs = pmxops->get_functions_count(pctldev);
 548         while (func_selector < nfuncs) {
 549                 const char *func = pmxops->get_function_name(pctldev,
 550                                                           func_selector);
 551                 const char * const *groups;
 552                 unsigned num_groups;
 553                 int ret;
 554                 int i;
 555
 556                 ret = pmxops->get_function_groups(pctldev, func_selector,
 557                                                   &groups, &num_groups);
 558                 if (ret) {
 559                         seq_printf(s, "function %s: COULD NOT GET GROUPS\n",
 560                                    func);
 561                         func_selector++;
 562                         continue;
 563                 }
 564
 565                 seq_printf(s, "function: %s, groups = [ ", func);
 566                 for (i = 0; i < num_groups; i++)
 567                         seq_printf(s, "%s ", groups[i]);
 568                 seq_puts(s, "]\n");
 569
 570                 func_selector++;
 571         }
 572
 573         mutex_unlock(&pctldev->mutex);
 574
 575         return 0;
 576 }
 577
 578 static int pinmux_pins_show(struct seq_file *s, void *what)
 579 {
 580         struct pinctrl_dev *pctldev = s->private;
 581         const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 582         const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
 583         unsigned i, pin;
 584
 585         if (!pmxops)
 586                 return 0;
 587
 588         seq_puts(s, "Pinmux settings per pin\n");
 589         if (pmxops->strict)
 590                 seq_puts(s,
 591                  "Format: pin (name): mux_owner|gpio_owner (strict) hog?\n");
 592         else
 593                 seq_puts(s,
 594                 "Format: pin (name): mux_owner gpio_owner hog?\n");
 595
 596         mutex_lock(&pctldev->mutex);
 597
 598         /* The pin number can be retrived from the pin controller descriptor */
 599         for (i = 0; i < pctldev->desc->npins; i++) {
 600                 struct pin_desc *desc;
 601                 bool is_hog = false;
 602
 603                 pin = pctldev->desc->pins[i].number;
 604                 desc = pin_desc_get(pctldev, pin);
 605                 /* Skip if we cannot search the pin */
 606                 if (desc == NULL)
 607                         continue;
 608
 609                 if (desc->mux_owner &&
 610                     !strcmp(desc->mux_owner, pinctrl_dev_get_name(pctldev)))
 611                         is_hog = true;
 612
 613                 if (pmxops->strict) {
 614                         if (desc->mux_owner)
 615                                 seq_printf(s, "pin %d (%s): device %s%s",
 616                                            pin,
 617                                            desc->name ? desc->name : "unnamed",
 618                                            desc->mux_owner,
 619                                            is_hog ? " (HOG)" : "");
 620                         else if (desc->gpio_owner)
 621                                 seq_printf(s, "pin %d (%s): GPIO %s",
 622                                            pin,
 623                                            desc->name ? desc->name : "unnamed",
 624                                            desc->gpio_owner);
 625                         else
 626                                 seq_printf(s, "pin %d (%s): UNCLAIMED",
 627                                            pin,
 628                                            desc->name ? desc->name : "unnamed");
 629                 } else {
 630                         /* For non-strict controllers */
 631                         seq_printf(s, "pin %d (%s): %s %s%s", pin,
 632                                    desc->name ? desc->name : "unnamed",
 633                                    desc->mux_owner ? desc->mux_owner
 634                                    : "(MUX UNCLAIMED)",
 635                                    desc->gpio_owner ? desc->gpio_owner
 636                                    : "(GPIO UNCLAIMED)",
 637                                    is_hog ? " (HOG)" : "");
 638                 }
 639
 640                 /* If mux: print function+group claiming the pin */
 641                 if (desc->mux_setting)
 642                         seq_printf(s, " function %s group %s\n",
 643                                    pmxops->get_function_name(pctldev,
 644                                         desc->mux_setting->func),
 645                                    pctlops->get_group_name(pctldev,
 646                                         desc->mux_setting->group));
 647                 else
 648                         seq_printf(s, "\n");
 649         }
 650
 651         mutex_unlock(&pctldev->mutex);
 652
 653         return 0;
 654 }
 655
 656 void pinmux_show_map(struct seq_file *s, struct pinctrl_map const *map)
 657 {
 658         seq_printf(s, "group %s\nfunction %s\n",
 659                 map->data.mux.group ? map->data.mux.group : "(default)",
 660                 map->data.mux.function);
 661 }
 662
 663 void pinmux_show_setting(struct seq_file *s,
 664                          struct pinctrl_setting const *setting)
 665 {
 666         struct pinctrl_dev *pctldev = setting->pctldev;
 667         const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
 668         const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
 669
 670         seq_printf(s, "group: %s (%u) function: %s (%u)\n",
 671                    pctlops->get_group_name(pctldev, setting->data.mux.group),
 672                    setting->data.mux.group,
 673                    pmxops->get_function_name(pctldev, setting->data.mux.func),
 674                    setting->data.mux.func);
 675 }
 676
 677 static int pinmux_functions_open(struct inode *inode, struct file *file)
 678 {
 679         return single_open(file, pinmux_functions_show, inode->i_private);
 680 }
 681
 682 static int pinmux_pins_open(struct inode *inode, struct file *file)
 683 {
 684         return single_open(file, pinmux_pins_show, inode->i_private);
 685 }
 686
 687 static const struct file_operations pinmux_functions_ops = {
 688         .open           = pinmux_functions_open,
 689         .read           = seq_read,
 690         .llseek         = seq_lseek,
 691         .release        = single_release,
 692 };
 693
 694 static const struct file_operations pinmux_pins_ops = {
 695         .open           = pinmux_pins_open,
 696         .read           = seq_read,
 697         .llseek         = seq_lseek,
 698         .release        = single_release,
 699 };
 700
 701 void pinmux_init_device_debugfs(struct dentry *devroot,
 702                          struct pinctrl_dev *pctldev)
 703 {
 704         debugfs_create_file("pinmux-functions", S_IFREG | S_IRUGO,
 705                             devroot, pctldev, &pinmux_functions_ops);
 706         debugfs_create_file("pinmux-pins", S_IFREG | S_IRUGO,
 707                             devroot, pctldev, &pinmux_pins_ops);
 708 }
 709
 710 #endif /* CONFIG_DEBUG_FS */