2 * Core driver for the pin control subsystem
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
8 * Author: Linus Walleij <linus.walleij@linaro.org>
10 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
12 * License terms: GNU General Public License (GPL) version 2
14 #define pr_fmt(fmt) "pinctrl core: " fmt
16 #include <linux/kernel.h>
17 #include <linux/kref.h>
18 #include <linux/export.h>
19 #include <linux/init.h>
20 #include <linux/device.h>
21 #include <linux/slab.h>
22 #include <linux/err.h>
23 #include <linux/list.h>
24 #include <linux/sysfs.h>
25 #include <linux/debugfs.h>
26 #include <linux/seq_file.h>
27 #include <linux/pinctrl/consumer.h>
28 #include <linux/pinctrl/pinctrl.h>
29 #include <linux/pinctrl/machine.h>
32 #include <asm-generic/gpio.h>
36 #include "devicetree.h"
41 static bool pinctrl_dummy_state;
43 /* Mutex taken to protect pinctrl_list */
44 static DEFINE_MUTEX(pinctrl_list_mutex);
46 /* Mutex taken to protect pinctrl_maps */
47 DEFINE_MUTEX(pinctrl_maps_mutex);
49 /* Mutex taken to protect pinctrldev_list */
50 static DEFINE_MUTEX(pinctrldev_list_mutex);
52 /* Global list of pin control devices (struct pinctrl_dev) */
53 static LIST_HEAD(pinctrldev_list);
55 /* List of pin controller handles (struct pinctrl) */
56 static LIST_HEAD(pinctrl_list);
58 /* List of pinctrl maps (struct pinctrl_maps) */
59 LIST_HEAD(pinctrl_maps);
63 * pinctrl_provide_dummies() - indicate if pinctrl provides dummy state support
65 * Usually this function is called by platforms without pinctrl driver support
66 * but run with some shared drivers using pinctrl APIs.
67 * After calling this function, the pinctrl core will return successfully
68 * with creating a dummy state for the driver to keep going smoothly.
70 void pinctrl_provide_dummies(void)
72 pinctrl_dummy_state = true;
75 const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev)
77 /* We're not allowed to register devices without name */
78 return pctldev->desc->name;
80 EXPORT_SYMBOL_GPL(pinctrl_dev_get_name);
82 const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev)
84 return dev_name(pctldev->dev);
86 EXPORT_SYMBOL_GPL(pinctrl_dev_get_devname);
88 void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev)
90 return pctldev->driver_data;
92 EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata);
95 * get_pinctrl_dev_from_devname() - look up pin controller device
96 * @devname: the name of a device instance, as returned by dev_name()
98 * Looks up a pin control device matching a certain device name or pure device
99 * pointer, the pure device pointer will take precedence.
101 struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname)
103 struct pinctrl_dev *pctldev = NULL;
108 mutex_lock(&pinctrldev_list_mutex);
110 list_for_each_entry(pctldev, &pinctrldev_list, node) {
111 if (!strcmp(dev_name(pctldev->dev), devname)) {
112 /* Matched on device name */
113 mutex_unlock(&pinctrldev_list_mutex);
118 mutex_unlock(&pinctrldev_list_mutex);
123 struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np)
125 struct pinctrl_dev *pctldev;
127 mutex_lock(&pinctrldev_list_mutex);
129 list_for_each_entry(pctldev, &pinctrldev_list, node)
130 if (pctldev->dev->of_node == np) {
131 mutex_unlock(&pinctrldev_list_mutex);
135 mutex_unlock(&pinctrldev_list_mutex);
141 * pin_get_from_name() - look up a pin number from a name
142 * @pctldev: the pin control device to lookup the pin on
143 * @name: the name of the pin to look up
145 int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name)
149 /* The pin number can be retrived from the pin controller descriptor */
150 for (i = 0; i < pctldev->desc->npins; i++) {
151 struct pin_desc *desc;
153 pin = pctldev->desc->pins[i].number;
154 desc = pin_desc_get(pctldev, pin);
155 /* Pin space may be sparse */
156 if (desc && !strcmp(name, desc->name))
164 * pin_get_name_from_id() - look up a pin name from a pin id
165 * @pctldev: the pin control device to lookup the pin on
166 * @name: the name of the pin to look up
168 const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin)
170 const struct pin_desc *desc;
172 desc = pin_desc_get(pctldev, pin);
174 dev_err(pctldev->dev, "failed to get pin(%d) name\n",
183 * pin_is_valid() - check if pin exists on controller
184 * @pctldev: the pin control device to check the pin on
185 * @pin: pin to check, use the local pin controller index number
187 * This tells us whether a certain pin exist on a certain pin controller or
188 * not. Pin lists may be sparse, so some pins may not exist.
190 bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
192 struct pin_desc *pindesc;
197 mutex_lock(&pctldev->mutex);
198 pindesc = pin_desc_get(pctldev, pin);
199 mutex_unlock(&pctldev->mutex);
201 return pindesc != NULL;
203 EXPORT_SYMBOL_GPL(pin_is_valid);
205 /* Deletes a range of pin descriptors */
206 static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev,
207 const struct pinctrl_pin_desc *pins,
212 for (i = 0; i < num_pins; i++) {
213 struct pin_desc *pindesc;
215 pindesc = radix_tree_lookup(&pctldev->pin_desc_tree,
217 if (pindesc != NULL) {
218 radix_tree_delete(&pctldev->pin_desc_tree,
220 if (pindesc->dynamic_name)
221 kfree(pindesc->name);
227 static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
228 unsigned number, const char *name)
230 struct pin_desc *pindesc;
232 pindesc = pin_desc_get(pctldev, number);
233 if (pindesc != NULL) {
234 dev_err(pctldev->dev, "pin %d already registered\n", number);
238 pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL);
239 if (pindesc == NULL) {
240 dev_err(pctldev->dev, "failed to alloc struct pin_desc\n");
245 pindesc->pctldev = pctldev;
247 /* Copy basic pin info */
249 pindesc->name = name;
251 pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number);
252 if (pindesc->name == NULL) {
256 pindesc->dynamic_name = true;
259 radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc);
260 pr_debug("registered pin %d (%s) on %s\n",
261 number, pindesc->name, pctldev->desc->name);
265 static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
266 struct pinctrl_pin_desc const *pins,
272 for (i = 0; i < num_descs; i++) {
273 ret = pinctrl_register_one_pin(pctldev,
274 pins[i].number, pins[i].name);
283 * gpio_to_pin() - GPIO range GPIO number to pin number translation
284 * @range: GPIO range used for the translation
285 * @gpio: gpio pin to translate to a pin number
287 * Finds the pin number for a given GPIO using the specified GPIO range
288 * as a base for translation. The distinction between linear GPIO ranges
289 * and pin list based GPIO ranges is managed correctly by this function.
291 * This function assumes the gpio is part of the specified GPIO range, use
292 * only after making sure this is the case (e.g. by calling it on the
293 * result of successful pinctrl_get_device_gpio_range calls)!
295 static inline int gpio_to_pin(struct pinctrl_gpio_range *range,
298 unsigned int offset = gpio - range->base;
300 return range->pins[offset];
302 return range->pin_base + offset;
306 * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
307 * @pctldev: pin controller device to check
308 * @gpio: gpio pin to check taken from the global GPIO pin space
310 * Tries to match a GPIO pin number to the ranges handled by a certain pin
311 * controller, return the range or NULL
313 static struct pinctrl_gpio_range *
314 pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
316 struct pinctrl_gpio_range *range = NULL;
318 mutex_lock(&pctldev->mutex);
319 /* Loop over the ranges */
320 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
321 /* Check if we're in the valid range */
322 if (gpio >= range->base &&
323 gpio < range->base + range->npins) {
324 mutex_unlock(&pctldev->mutex);
328 mutex_unlock(&pctldev->mutex);
333 * pinctrl_ready_for_gpio_range() - check if other GPIO pins of
334 * the same GPIO chip are in range
335 * @gpio: gpio pin to check taken from the global GPIO pin space
337 * This function is complement of pinctrl_match_gpio_range(). If the return
338 * value of pinctrl_match_gpio_range() is NULL, this function could be used
339 * to check whether pinctrl device is ready or not. Maybe some GPIO pins
340 * of the same GPIO chip don't have back-end pinctrl interface.
341 * If the return value is true, it means that pinctrl device is ready & the
342 * certain GPIO pin doesn't have back-end pinctrl device. If the return value
343 * is false, it means that pinctrl device may not be ready.
345 #ifdef CONFIG_GPIOLIB
346 static bool pinctrl_ready_for_gpio_range(unsigned gpio)
348 struct pinctrl_dev *pctldev;
349 struct pinctrl_gpio_range *range = NULL;
350 struct gpio_chip *chip = gpio_to_chip(gpio);
352 if (WARN(!chip, "no gpio_chip for gpio%i?", gpio))
355 mutex_lock(&pinctrldev_list_mutex);
357 /* Loop over the pin controllers */
358 list_for_each_entry(pctldev, &pinctrldev_list, node) {
359 /* Loop over the ranges */
360 mutex_lock(&pctldev->mutex);
361 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
362 /* Check if any gpio range overlapped with gpio chip */
363 if (range->base + range->npins - 1 < chip->base ||
364 range->base > chip->base + chip->ngpio - 1)
366 mutex_unlock(&pctldev->mutex);
367 mutex_unlock(&pinctrldev_list_mutex);
370 mutex_unlock(&pctldev->mutex);
373 mutex_unlock(&pinctrldev_list_mutex);
378 static bool pinctrl_ready_for_gpio_range(unsigned gpio) { return true; }
382 * pinctrl_get_device_gpio_range() - find device for GPIO range
383 * @gpio: the pin to locate the pin controller for
384 * @outdev: the pin control device if found
385 * @outrange: the GPIO range if found
387 * Find the pin controller handling a certain GPIO pin from the pinspace of
388 * the GPIO subsystem, return the device and the matching GPIO range. Returns
389 * -EPROBE_DEFER if the GPIO range could not be found in any device since it
390 * may still have not been registered.
392 static int pinctrl_get_device_gpio_range(unsigned gpio,
393 struct pinctrl_dev **outdev,
394 struct pinctrl_gpio_range **outrange)
396 struct pinctrl_dev *pctldev = NULL;
398 mutex_lock(&pinctrldev_list_mutex);
400 /* Loop over the pin controllers */
401 list_for_each_entry(pctldev, &pinctrldev_list, node) {
402 struct pinctrl_gpio_range *range;
404 range = pinctrl_match_gpio_range(pctldev, gpio);
408 mutex_unlock(&pinctrldev_list_mutex);
413 mutex_unlock(&pinctrldev_list_mutex);
415 return -EPROBE_DEFER;
419 * pinctrl_add_gpio_range() - register a GPIO range for a controller
420 * @pctldev: pin controller device to add the range to
421 * @range: the GPIO range to add
423 * This adds a range of GPIOs to be handled by a certain pin controller. Call
424 * this to register handled ranges after registering your pin controller.
426 void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
427 struct pinctrl_gpio_range *range)
429 mutex_lock(&pctldev->mutex);
430 list_add_tail(&range->node, &pctldev->gpio_ranges);
431 mutex_unlock(&pctldev->mutex);
433 EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
435 void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
436 struct pinctrl_gpio_range *ranges,
441 for (i = 0; i < nranges; i++)
442 pinctrl_add_gpio_range(pctldev, &ranges[i]);
444 EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges);
446 struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
447 struct pinctrl_gpio_range *range)
449 struct pinctrl_dev *pctldev;
451 pctldev = get_pinctrl_dev_from_devname(devname);
454 * If we can't find this device, let's assume that is because
455 * it has not probed yet, so the driver trying to register this
456 * range need to defer probing.
459 return ERR_PTR(-EPROBE_DEFER);
461 pinctrl_add_gpio_range(pctldev, range);
465 EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range);
467 int pinctrl_get_group_pins(struct pinctrl_dev *pctldev, const char *pin_group,
468 const unsigned **pins, unsigned *num_pins)
470 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
473 if (!pctlops->get_group_pins)
476 gs = pinctrl_get_group_selector(pctldev, pin_group);
480 return pctlops->get_group_pins(pctldev, gs, pins, num_pins);
482 EXPORT_SYMBOL_GPL(pinctrl_get_group_pins);
485 * pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin
486 * @pctldev: the pin controller device to look in
487 * @pin: a controller-local number to find the range for
489 struct pinctrl_gpio_range *
490 pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
493 struct pinctrl_gpio_range *range;
495 mutex_lock(&pctldev->mutex);
496 /* Loop over the ranges */
497 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
498 /* Check if we're in the valid range */
501 for (a = 0; a < range->npins; a++) {
502 if (range->pins[a] == pin)
505 } else if (pin >= range->pin_base &&
506 pin < range->pin_base + range->npins)
511 mutex_unlock(&pctldev->mutex);
514 EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin);
517 * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller
518 * @pctldev: pin controller device to remove the range from
519 * @range: the GPIO range to remove
521 void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
522 struct pinctrl_gpio_range *range)
524 mutex_lock(&pctldev->mutex);
525 list_del(&range->node);
526 mutex_unlock(&pctldev->mutex);
528 EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range);
531 * pinctrl_get_group_selector() - returns the group selector for a group
532 * @pctldev: the pin controller handling the group
533 * @pin_group: the pin group to look up
535 int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
536 const char *pin_group)
538 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
539 unsigned ngroups = pctlops->get_groups_count(pctldev);
540 unsigned group_selector = 0;
542 while (group_selector < ngroups) {
543 const char *gname = pctlops->get_group_name(pctldev,
545 if (!strcmp(gname, pin_group)) {
546 dev_dbg(pctldev->dev,
547 "found group selector %u for %s\n",
550 return group_selector;
556 dev_err(pctldev->dev, "does not have pin group %s\n",
563 * pinctrl_request_gpio() - request a single pin to be used as GPIO
564 * @gpio: the GPIO pin number from the GPIO subsystem number space
566 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
567 * as part of their gpio_request() semantics, platforms and individual drivers
568 * shall *NOT* request GPIO pins to be muxed in.
570 int pinctrl_request_gpio(unsigned gpio)
572 struct pinctrl_dev *pctldev;
573 struct pinctrl_gpio_range *range;
577 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
579 if (pinctrl_ready_for_gpio_range(gpio))
584 mutex_lock(&pctldev->mutex);
586 /* Convert to the pin controllers number space */
587 pin = gpio_to_pin(range, gpio);
589 ret = pinmux_request_gpio(pctldev, range, pin, gpio);
591 mutex_unlock(&pctldev->mutex);
595 EXPORT_SYMBOL_GPL(pinctrl_request_gpio);
598 * pinctrl_free_gpio() - free control on a single pin, currently used as GPIO
599 * @gpio: the GPIO pin number from the GPIO subsystem number space
601 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
602 * as part of their gpio_free() semantics, platforms and individual drivers
603 * shall *NOT* request GPIO pins to be muxed out.
605 void pinctrl_free_gpio(unsigned gpio)
607 struct pinctrl_dev *pctldev;
608 struct pinctrl_gpio_range *range;
612 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
616 mutex_lock(&pctldev->mutex);
618 /* Convert to the pin controllers number space */
619 pin = gpio_to_pin(range, gpio);
621 pinmux_free_gpio(pctldev, pin, range);
623 mutex_unlock(&pctldev->mutex);
625 EXPORT_SYMBOL_GPL(pinctrl_free_gpio);
627 static int pinctrl_gpio_direction(unsigned gpio, bool input)
629 struct pinctrl_dev *pctldev;
630 struct pinctrl_gpio_range *range;
634 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
639 mutex_lock(&pctldev->mutex);
641 /* Convert to the pin controllers number space */
642 pin = gpio_to_pin(range, gpio);
643 ret = pinmux_gpio_direction(pctldev, range, pin, input);
645 mutex_unlock(&pctldev->mutex);
651 * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode
652 * @gpio: the GPIO pin number from the GPIO subsystem number space
654 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
655 * as part of their gpio_direction_input() semantics, platforms and individual
656 * drivers shall *NOT* touch pin control GPIO calls.
658 int pinctrl_gpio_direction_input(unsigned gpio)
660 return pinctrl_gpio_direction(gpio, true);
662 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
665 * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode
666 * @gpio: the GPIO pin number from the GPIO subsystem number space
668 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
669 * as part of their gpio_direction_output() semantics, platforms and individual
670 * drivers shall *NOT* touch pin control GPIO calls.
672 int pinctrl_gpio_direction_output(unsigned gpio)
674 return pinctrl_gpio_direction(gpio, false);
676 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
678 static struct pinctrl_state *find_state(struct pinctrl *p,
681 struct pinctrl_state *state;
683 list_for_each_entry(state, &p->states, node)
684 if (!strcmp(state->name, name))
690 static struct pinctrl_state *create_state(struct pinctrl *p,
693 struct pinctrl_state *state;
695 state = kzalloc(sizeof(*state), GFP_KERNEL);
698 "failed to alloc struct pinctrl_state\n");
699 return ERR_PTR(-ENOMEM);
703 INIT_LIST_HEAD(&state->settings);
705 list_add_tail(&state->node, &p->states);
710 static int add_setting(struct pinctrl *p, struct pinctrl_map const *map)
712 struct pinctrl_state *state;
713 struct pinctrl_setting *setting;
716 state = find_state(p, map->name);
718 state = create_state(p, map->name);
720 return PTR_ERR(state);
722 if (map->type == PIN_MAP_TYPE_DUMMY_STATE)
725 setting = kzalloc(sizeof(*setting), GFP_KERNEL);
726 if (setting == NULL) {
728 "failed to alloc struct pinctrl_setting\n");
732 setting->type = map->type;
734 setting->pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
735 if (setting->pctldev == NULL) {
737 /* Do not defer probing of hogs (circular loop) */
738 if (!strcmp(map->ctrl_dev_name, map->dev_name))
741 * OK let us guess that the driver is not there yet, and
742 * let's defer obtaining this pinctrl handle to later...
744 dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe",
746 return -EPROBE_DEFER;
749 setting->dev_name = map->dev_name;
752 case PIN_MAP_TYPE_MUX_GROUP:
753 ret = pinmux_map_to_setting(map, setting);
755 case PIN_MAP_TYPE_CONFIGS_PIN:
756 case PIN_MAP_TYPE_CONFIGS_GROUP:
757 ret = pinconf_map_to_setting(map, setting);
768 list_add_tail(&setting->node, &state->settings);
773 static struct pinctrl *find_pinctrl(struct device *dev)
777 mutex_lock(&pinctrl_list_mutex);
778 list_for_each_entry(p, &pinctrl_list, node)
780 mutex_unlock(&pinctrl_list_mutex);
784 mutex_unlock(&pinctrl_list_mutex);
788 static void pinctrl_free(struct pinctrl *p, bool inlist);
790 static struct pinctrl *create_pinctrl(struct device *dev)
794 struct pinctrl_maps *maps_node;
796 struct pinctrl_map const *map;
800 * create the state cookie holder struct pinctrl for each
801 * mapping, this is what consumers will get when requesting
802 * a pin control handle with pinctrl_get()
804 p = kzalloc(sizeof(*p), GFP_KERNEL);
806 dev_err(dev, "failed to alloc struct pinctrl\n");
807 return ERR_PTR(-ENOMEM);
810 INIT_LIST_HEAD(&p->states);
811 INIT_LIST_HEAD(&p->dt_maps);
813 ret = pinctrl_dt_to_map(p);
819 devname = dev_name(dev);
821 mutex_lock(&pinctrl_maps_mutex);
822 /* Iterate over the pin control maps to locate the right ones */
823 for_each_maps(maps_node, i, map) {
824 /* Map must be for this device */
825 if (strcmp(map->dev_name, devname))
828 ret = add_setting(p, map);
830 * At this point the adding of a setting may:
832 * - Defer, if the pinctrl device is not yet available
833 * - Fail, if the pinctrl device is not yet available,
834 * AND the setting is a hog. We cannot defer that, since
835 * the hog will kick in immediately after the device
838 * If the error returned was not -EPROBE_DEFER then we
839 * accumulate the errors to see if we end up with
840 * an -EPROBE_DEFER later, as that is the worst case.
842 if (ret == -EPROBE_DEFER) {
843 pinctrl_free(p, false);
844 mutex_unlock(&pinctrl_maps_mutex);
848 mutex_unlock(&pinctrl_maps_mutex);
851 /* If some other error than deferral occured, return here */
852 pinctrl_free(p, false);
856 kref_init(&p->users);
858 /* Add the pinctrl handle to the global list */
859 mutex_lock(&pinctrl_list_mutex);
860 list_add_tail(&p->node, &pinctrl_list);
861 mutex_unlock(&pinctrl_list_mutex);
867 * pinctrl_get() - retrieves the pinctrl handle for a device
868 * @dev: the device to obtain the handle for
870 struct pinctrl *pinctrl_get(struct device *dev)
875 return ERR_PTR(-EINVAL);
878 * See if somebody else (such as the device core) has already
879 * obtained a handle to the pinctrl for this device. In that case,
880 * return another pointer to it.
882 p = find_pinctrl(dev);
884 dev_dbg(dev, "obtain a copy of previously claimed pinctrl\n");
889 return create_pinctrl(dev);
891 EXPORT_SYMBOL_GPL(pinctrl_get);
893 static void pinctrl_free_setting(bool disable_setting,
894 struct pinctrl_setting *setting)
896 switch (setting->type) {
897 case PIN_MAP_TYPE_MUX_GROUP:
899 pinmux_disable_setting(setting);
900 pinmux_free_setting(setting);
902 case PIN_MAP_TYPE_CONFIGS_PIN:
903 case PIN_MAP_TYPE_CONFIGS_GROUP:
904 pinconf_free_setting(setting);
911 static void pinctrl_free(struct pinctrl *p, bool inlist)
913 struct pinctrl_state *state, *n1;
914 struct pinctrl_setting *setting, *n2;
916 mutex_lock(&pinctrl_list_mutex);
917 list_for_each_entry_safe(state, n1, &p->states, node) {
918 list_for_each_entry_safe(setting, n2, &state->settings, node) {
919 pinctrl_free_setting(state == p->state, setting);
920 list_del(&setting->node);
923 list_del(&state->node);
927 pinctrl_dt_free_maps(p);
932 mutex_unlock(&pinctrl_list_mutex);
936 * pinctrl_release() - release the pinctrl handle
937 * @kref: the kref in the pinctrl being released
939 static void pinctrl_release(struct kref *kref)
941 struct pinctrl *p = container_of(kref, struct pinctrl, users);
943 pinctrl_free(p, true);
947 * pinctrl_put() - decrease use count on a previously claimed pinctrl handle
948 * @p: the pinctrl handle to release
950 void pinctrl_put(struct pinctrl *p)
952 kref_put(&p->users, pinctrl_release);
954 EXPORT_SYMBOL_GPL(pinctrl_put);
957 * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle
958 * @p: the pinctrl handle to retrieve the state from
959 * @name: the state name to retrieve
961 struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p,
964 struct pinctrl_state *state;
966 state = find_state(p, name);
968 if (pinctrl_dummy_state) {
969 /* create dummy state */
970 dev_dbg(p->dev, "using pinctrl dummy state (%s)\n",
972 state = create_state(p, name);
974 state = ERR_PTR(-ENODEV);
979 EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
982 * pinctrl_select_state() - select/activate/program a pinctrl state to HW
983 * @p: the pinctrl handle for the device that requests configuration
984 * @state: the state handle to select/activate/program
986 int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
988 struct pinctrl_setting *setting, *setting2;
989 struct pinctrl_state *old_state = p->state;
992 if (p->state == state)
997 * For each pinmux setting in the old state, forget SW's record
998 * of mux owner for that pingroup. Any pingroups which are
999 * still owned by the new state will be re-acquired by the call
1000 * to pinmux_enable_setting() in the loop below.
1002 list_for_each_entry(setting, &p->state->settings, node) {
1003 if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
1005 pinmux_disable_setting(setting);
1011 /* Apply all the settings for the new state */
1012 list_for_each_entry(setting, &state->settings, node) {
1013 switch (setting->type) {
1014 case PIN_MAP_TYPE_MUX_GROUP:
1015 ret = pinmux_enable_setting(setting);
1017 case PIN_MAP_TYPE_CONFIGS_PIN:
1018 case PIN_MAP_TYPE_CONFIGS_GROUP:
1019 ret = pinconf_apply_setting(setting);
1027 goto unapply_new_state;
1036 dev_err(p->dev, "Error applying setting, reverse things back\n");
1038 list_for_each_entry(setting2, &state->settings, node) {
1039 if (&setting2->node == &setting->node)
1042 * All we can do here is pinmux_disable_setting.
1043 * That means that some pins are muxed differently now
1044 * than they were before applying the setting (We can't
1045 * "unmux a pin"!), but it's not a big deal since the pins
1046 * are free to be muxed by another apply_setting.
1048 if (setting2->type == PIN_MAP_TYPE_MUX_GROUP)
1049 pinmux_disable_setting(setting2);
1052 /* There's no infinite recursive loop here because p->state is NULL */
1054 pinctrl_select_state(p, old_state);
1058 EXPORT_SYMBOL_GPL(pinctrl_select_state);
1060 static void devm_pinctrl_release(struct device *dev, void *res)
1062 pinctrl_put(*(struct pinctrl **)res);
1066 * struct devm_pinctrl_get() - Resource managed pinctrl_get()
1067 * @dev: the device to obtain the handle for
1069 * If there is a need to explicitly destroy the returned struct pinctrl,
1070 * devm_pinctrl_put() should be used, rather than plain pinctrl_put().
1072 struct pinctrl *devm_pinctrl_get(struct device *dev)
1074 struct pinctrl **ptr, *p;
1076 ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL);
1078 return ERR_PTR(-ENOMEM);
1080 p = pinctrl_get(dev);
1083 devres_add(dev, ptr);
1090 EXPORT_SYMBOL_GPL(devm_pinctrl_get);
1092 static int devm_pinctrl_match(struct device *dev, void *res, void *data)
1094 struct pinctrl **p = res;
1100 * devm_pinctrl_put() - Resource managed pinctrl_put()
1101 * @p: the pinctrl handle to release
1103 * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally
1104 * this function will not need to be called and the resource management
1105 * code will ensure that the resource is freed.
1107 void devm_pinctrl_put(struct pinctrl *p)
1109 WARN_ON(devres_release(p->dev, devm_pinctrl_release,
1110 devm_pinctrl_match, p));
1112 EXPORT_SYMBOL_GPL(devm_pinctrl_put);
1114 int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,
1118 struct pinctrl_maps *maps_node;
1120 pr_debug("add %u pinctrl maps\n", num_maps);
1122 /* First sanity check the new mapping */
1123 for (i = 0; i < num_maps; i++) {
1124 if (!maps[i].dev_name) {
1125 pr_err("failed to register map %s (%d): no device given\n",
1130 if (!maps[i].name) {
1131 pr_err("failed to register map %d: no map name given\n",
1136 if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE &&
1137 !maps[i].ctrl_dev_name) {
1138 pr_err("failed to register map %s (%d): no pin control device given\n",
1143 switch (maps[i].type) {
1144 case PIN_MAP_TYPE_DUMMY_STATE:
1146 case PIN_MAP_TYPE_MUX_GROUP:
1147 ret = pinmux_validate_map(&maps[i], i);
1151 case PIN_MAP_TYPE_CONFIGS_PIN:
1152 case PIN_MAP_TYPE_CONFIGS_GROUP:
1153 ret = pinconf_validate_map(&maps[i], i);
1158 pr_err("failed to register map %s (%d): invalid type given\n",
1164 maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL);
1166 pr_err("failed to alloc struct pinctrl_maps\n");
1170 maps_node->num_maps = num_maps;
1172 maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps,
1174 if (!maps_node->maps) {
1175 pr_err("failed to duplicate mapping table\n");
1180 maps_node->maps = maps;
1183 mutex_lock(&pinctrl_maps_mutex);
1184 list_add_tail(&maps_node->node, &pinctrl_maps);
1185 mutex_unlock(&pinctrl_maps_mutex);
1191 * pinctrl_register_mappings() - register a set of pin controller mappings
1192 * @maps: the pincontrol mappings table to register. This should probably be
1193 * marked with __initdata so it can be discarded after boot. This
1194 * function will perform a shallow copy for the mapping entries.
1195 * @num_maps: the number of maps in the mapping table
1197 int pinctrl_register_mappings(struct pinctrl_map const *maps,
1200 return pinctrl_register_map(maps, num_maps, true);
1203 void pinctrl_unregister_map(struct pinctrl_map const *map)
1205 struct pinctrl_maps *maps_node;
1207 mutex_lock(&pinctrl_maps_mutex);
1208 list_for_each_entry(maps_node, &pinctrl_maps, node) {
1209 if (maps_node->maps == map) {
1210 list_del(&maps_node->node);
1212 mutex_unlock(&pinctrl_maps_mutex);
1216 mutex_unlock(&pinctrl_maps_mutex);
1220 * pinctrl_force_sleep() - turn a given controller device into sleep state
1221 * @pctldev: pin controller device
1223 int pinctrl_force_sleep(struct pinctrl_dev *pctldev)
1225 if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_sleep))
1226 return pinctrl_select_state(pctldev->p, pctldev->hog_sleep);
1229 EXPORT_SYMBOL_GPL(pinctrl_force_sleep);
1232 * pinctrl_force_default() - turn a given controller device into default state
1233 * @pctldev: pin controller device
1235 int pinctrl_force_default(struct pinctrl_dev *pctldev)
1237 if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_default))
1238 return pinctrl_select_state(pctldev->p, pctldev->hog_default);
1241 EXPORT_SYMBOL_GPL(pinctrl_force_default);
1244 * pinctrl_init_done() - tell pinctrl probe is done
1246 * We'll use this time to switch the pins from "init" to "default" unless the
1247 * driver selected some other state.
1249 * @dev: device to that's done probing
1251 int pinctrl_init_done(struct device *dev)
1253 struct dev_pin_info *pins = dev->pins;
1259 if (IS_ERR(pins->init_state))
1260 return 0; /* No such state */
1262 if (pins->p->state != pins->init_state)
1263 return 0; /* Not at init anyway */
1265 if (IS_ERR(pins->default_state))
1266 return 0; /* No default state */
1268 ret = pinctrl_select_state(pins->p, pins->default_state);
1270 dev_err(dev, "failed to activate default pinctrl state\n");
1278 * pinctrl_pm_select_state() - select pinctrl state for PM
1279 * @dev: device to select default state for
1280 * @state: state to set
1282 static int pinctrl_pm_select_state(struct device *dev,
1283 struct pinctrl_state *state)
1285 struct dev_pin_info *pins = dev->pins;
1289 return 0; /* No such state */
1290 ret = pinctrl_select_state(pins->p, state);
1292 dev_err(dev, "failed to activate pinctrl state %s\n",
1298 * pinctrl_pm_select_default_state() - select default pinctrl state for PM
1299 * @dev: device to select default state for
1301 int pinctrl_pm_select_default_state(struct device *dev)
1306 return pinctrl_pm_select_state(dev, dev->pins->default_state);
1308 EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state);
1311 * pinctrl_pm_select_sleep_state() - select sleep pinctrl state for PM
1312 * @dev: device to select sleep state for
1314 int pinctrl_pm_select_sleep_state(struct device *dev)
1319 return pinctrl_pm_select_state(dev, dev->pins->sleep_state);
1321 EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state);
1324 * pinctrl_pm_select_idle_state() - select idle pinctrl state for PM
1325 * @dev: device to select idle state for
1327 int pinctrl_pm_select_idle_state(struct device *dev)
1332 return pinctrl_pm_select_state(dev, dev->pins->idle_state);
1334 EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state);
1337 #ifdef CONFIG_DEBUG_FS
1339 static int pinctrl_pins_show(struct seq_file *s, void *what)
1341 struct pinctrl_dev *pctldev = s->private;
1342 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1345 seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
1347 mutex_lock(&pctldev->mutex);
1349 /* The pin number can be retrived from the pin controller descriptor */
1350 for (i = 0; i < pctldev->desc->npins; i++) {
1351 struct pin_desc *desc;
1353 pin = pctldev->desc->pins[i].number;
1354 desc = pin_desc_get(pctldev, pin);
1355 /* Pin space may be sparse */
1359 seq_printf(s, "pin %d (%s) ", pin,
1360 desc->name ? desc->name : "unnamed");
1362 /* Driver-specific info per pin */
1363 if (ops->pin_dbg_show)
1364 ops->pin_dbg_show(pctldev, s, pin);
1369 mutex_unlock(&pctldev->mutex);
1374 static int pinctrl_groups_show(struct seq_file *s, void *what)
1376 struct pinctrl_dev *pctldev = s->private;
1377 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1378 unsigned ngroups, selector = 0;
1380 mutex_lock(&pctldev->mutex);
1382 ngroups = ops->get_groups_count(pctldev);
1384 seq_puts(s, "registered pin groups:\n");
1385 while (selector < ngroups) {
1386 const unsigned *pins = NULL;
1387 unsigned num_pins = 0;
1388 const char *gname = ops->get_group_name(pctldev, selector);
1393 if (ops->get_group_pins)
1394 ret = ops->get_group_pins(pctldev, selector,
1397 seq_printf(s, "%s [ERROR GETTING PINS]\n",
1400 seq_printf(s, "group: %s\n", gname);
1401 for (i = 0; i < num_pins; i++) {
1402 pname = pin_get_name(pctldev, pins[i]);
1403 if (WARN_ON(!pname)) {
1404 mutex_unlock(&pctldev->mutex);
1407 seq_printf(s, "pin %d (%s)\n", pins[i], pname);
1414 mutex_unlock(&pctldev->mutex);
1419 static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
1421 struct pinctrl_dev *pctldev = s->private;
1422 struct pinctrl_gpio_range *range = NULL;
1424 seq_puts(s, "GPIO ranges handled:\n");
1426 mutex_lock(&pctldev->mutex);
1428 /* Loop over the ranges */
1429 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
1432 seq_printf(s, "%u: %s GPIOS [%u - %u] PINS {",
1433 range->id, range->name,
1434 range->base, (range->base + range->npins - 1));
1435 for (a = 0; a < range->npins - 1; a++)
1436 seq_printf(s, "%u, ", range->pins[a]);
1437 seq_printf(s, "%u}\n", range->pins[a]);
1440 seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
1441 range->id, range->name,
1442 range->base, (range->base + range->npins - 1),
1444 (range->pin_base + range->npins - 1));
1447 mutex_unlock(&pctldev->mutex);
1452 static int pinctrl_devices_show(struct seq_file *s, void *what)
1454 struct pinctrl_dev *pctldev;
1456 seq_puts(s, "name [pinmux] [pinconf]\n");
1458 mutex_lock(&pinctrldev_list_mutex);
1460 list_for_each_entry(pctldev, &pinctrldev_list, node) {
1461 seq_printf(s, "%s ", pctldev->desc->name);
1462 if (pctldev->desc->pmxops)
1463 seq_puts(s, "yes ");
1466 if (pctldev->desc->confops)
1473 mutex_unlock(&pinctrldev_list_mutex);
1478 static inline const char *map_type(enum pinctrl_map_type type)
1480 static const char * const names[] = {
1488 if (type >= ARRAY_SIZE(names))
1494 static int pinctrl_maps_show(struct seq_file *s, void *what)
1496 struct pinctrl_maps *maps_node;
1498 struct pinctrl_map const *map;
1500 seq_puts(s, "Pinctrl maps:\n");
1502 mutex_lock(&pinctrl_maps_mutex);
1503 for_each_maps(maps_node, i, map) {
1504 seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n",
1505 map->dev_name, map->name, map_type(map->type),
1508 if (map->type != PIN_MAP_TYPE_DUMMY_STATE)
1509 seq_printf(s, "controlling device %s\n",
1510 map->ctrl_dev_name);
1512 switch (map->type) {
1513 case PIN_MAP_TYPE_MUX_GROUP:
1514 pinmux_show_map(s, map);
1516 case PIN_MAP_TYPE_CONFIGS_PIN:
1517 case PIN_MAP_TYPE_CONFIGS_GROUP:
1518 pinconf_show_map(s, map);
1524 seq_printf(s, "\n");
1526 mutex_unlock(&pinctrl_maps_mutex);
1531 static int pinctrl_show(struct seq_file *s, void *what)
1534 struct pinctrl_state *state;
1535 struct pinctrl_setting *setting;
1537 seq_puts(s, "Requested pin control handlers their pinmux maps:\n");
1539 mutex_lock(&pinctrl_list_mutex);
1541 list_for_each_entry(p, &pinctrl_list, node) {
1542 seq_printf(s, "device: %s current state: %s\n",
1544 p->state ? p->state->name : "none");
1546 list_for_each_entry(state, &p->states, node) {
1547 seq_printf(s, " state: %s\n", state->name);
1549 list_for_each_entry(setting, &state->settings, node) {
1550 struct pinctrl_dev *pctldev = setting->pctldev;
1552 seq_printf(s, " type: %s controller %s ",
1553 map_type(setting->type),
1554 pinctrl_dev_get_name(pctldev));
1556 switch (setting->type) {
1557 case PIN_MAP_TYPE_MUX_GROUP:
1558 pinmux_show_setting(s, setting);
1560 case PIN_MAP_TYPE_CONFIGS_PIN:
1561 case PIN_MAP_TYPE_CONFIGS_GROUP:
1562 pinconf_show_setting(s, setting);
1571 mutex_unlock(&pinctrl_list_mutex);
1576 static int pinctrl_pins_open(struct inode *inode, struct file *file)
1578 return single_open(file, pinctrl_pins_show, inode->i_private);
1581 static int pinctrl_groups_open(struct inode *inode, struct file *file)
1583 return single_open(file, pinctrl_groups_show, inode->i_private);
1586 static int pinctrl_gpioranges_open(struct inode *inode, struct file *file)
1588 return single_open(file, pinctrl_gpioranges_show, inode->i_private);
1591 static int pinctrl_devices_open(struct inode *inode, struct file *file)
1593 return single_open(file, pinctrl_devices_show, NULL);
1596 static int pinctrl_maps_open(struct inode *inode, struct file *file)
1598 return single_open(file, pinctrl_maps_show, NULL);
1601 static int pinctrl_open(struct inode *inode, struct file *file)
1603 return single_open(file, pinctrl_show, NULL);
1606 static const struct file_operations pinctrl_pins_ops = {
1607 .open = pinctrl_pins_open,
1609 .llseek = seq_lseek,
1610 .release = single_release,
1613 static const struct file_operations pinctrl_groups_ops = {
1614 .open = pinctrl_groups_open,
1616 .llseek = seq_lseek,
1617 .release = single_release,
1620 static const struct file_operations pinctrl_gpioranges_ops = {
1621 .open = pinctrl_gpioranges_open,
1623 .llseek = seq_lseek,
1624 .release = single_release,
1627 static const struct file_operations pinctrl_devices_ops = {
1628 .open = pinctrl_devices_open,
1630 .llseek = seq_lseek,
1631 .release = single_release,
1634 static const struct file_operations pinctrl_maps_ops = {
1635 .open = pinctrl_maps_open,
1637 .llseek = seq_lseek,
1638 .release = single_release,
1641 static const struct file_operations pinctrl_ops = {
1642 .open = pinctrl_open,
1644 .llseek = seq_lseek,
1645 .release = single_release,
1648 static struct dentry *debugfs_root;
1650 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1652 struct dentry *device_root;
1654 device_root = debugfs_create_dir(dev_name(pctldev->dev),
1656 pctldev->device_root = device_root;
1658 if (IS_ERR(device_root) || !device_root) {
1659 pr_warn("failed to create debugfs directory for %s\n",
1660 dev_name(pctldev->dev));
1663 debugfs_create_file("pins", S_IFREG | S_IRUGO,
1664 device_root, pctldev, &pinctrl_pins_ops);
1665 debugfs_create_file("pingroups", S_IFREG | S_IRUGO,
1666 device_root, pctldev, &pinctrl_groups_ops);
1667 debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO,
1668 device_root, pctldev, &pinctrl_gpioranges_ops);
1669 if (pctldev->desc->pmxops)
1670 pinmux_init_device_debugfs(device_root, pctldev);
1671 if (pctldev->desc->confops)
1672 pinconf_init_device_debugfs(device_root, pctldev);
1675 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1677 debugfs_remove_recursive(pctldev->device_root);
1680 static void pinctrl_init_debugfs(void)
1682 debugfs_root = debugfs_create_dir("pinctrl", NULL);
1683 if (IS_ERR(debugfs_root) || !debugfs_root) {
1684 pr_warn("failed to create debugfs directory\n");
1685 debugfs_root = NULL;
1689 debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO,
1690 debugfs_root, NULL, &pinctrl_devices_ops);
1691 debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO,
1692 debugfs_root, NULL, &pinctrl_maps_ops);
1693 debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO,
1694 debugfs_root, NULL, &pinctrl_ops);
1697 #else /* CONFIG_DEBUG_FS */
1699 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1703 static void pinctrl_init_debugfs(void)
1707 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1713 static int pinctrl_check_ops(struct pinctrl_dev *pctldev)
1715 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1718 !ops->get_groups_count ||
1719 !ops->get_group_name)
1722 if (ops->dt_node_to_map && !ops->dt_free_map)
1729 * pinctrl_register() - register a pin controller device
1730 * @pctldesc: descriptor for this pin controller
1731 * @dev: parent device for this pin controller
1732 * @driver_data: private pin controller data for this pin controller
1734 struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
1735 struct device *dev, void *driver_data)
1737 struct pinctrl_dev *pctldev;
1741 return ERR_PTR(-EINVAL);
1742 if (!pctldesc->name)
1743 return ERR_PTR(-EINVAL);
1745 pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL);
1746 if (pctldev == NULL) {
1747 dev_err(dev, "failed to alloc struct pinctrl_dev\n");
1748 return ERR_PTR(-ENOMEM);
1751 /* Initialize pin control device struct */
1752 pctldev->owner = pctldesc->owner;
1753 pctldev->desc = pctldesc;
1754 pctldev->driver_data = driver_data;
1755 INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
1756 INIT_LIST_HEAD(&pctldev->gpio_ranges);
1758 mutex_init(&pctldev->mutex);
1760 /* check core ops for sanity */
1761 ret = pinctrl_check_ops(pctldev);
1763 dev_err(dev, "pinctrl ops lacks necessary functions\n");
1767 /* If we're implementing pinmuxing, check the ops for sanity */
1768 if (pctldesc->pmxops) {
1769 ret = pinmux_check_ops(pctldev);
1774 /* If we're implementing pinconfig, check the ops for sanity */
1775 if (pctldesc->confops) {
1776 ret = pinconf_check_ops(pctldev);
1781 /* Register all the pins */
1782 dev_dbg(dev, "try to register %d pins ...\n", pctldesc->npins);
1783 ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins);
1785 dev_err(dev, "error during pin registration\n");
1786 pinctrl_free_pindescs(pctldev, pctldesc->pins,
1791 mutex_lock(&pinctrldev_list_mutex);
1792 list_add_tail(&pctldev->node, &pinctrldev_list);
1793 mutex_unlock(&pinctrldev_list_mutex);
1795 pctldev->p = pinctrl_get(pctldev->dev);
1797 if (!IS_ERR(pctldev->p)) {
1798 pctldev->hog_default =
1799 pinctrl_lookup_state(pctldev->p, PINCTRL_STATE_DEFAULT);
1800 if (IS_ERR(pctldev->hog_default)) {
1801 dev_dbg(dev, "failed to lookup the default state\n");
1803 if (pinctrl_select_state(pctldev->p,
1804 pctldev->hog_default))
1806 "failed to select default state\n");
1809 pctldev->hog_sleep =
1810 pinctrl_lookup_state(pctldev->p,
1811 PINCTRL_STATE_SLEEP);
1812 if (IS_ERR(pctldev->hog_sleep))
1813 dev_dbg(dev, "failed to lookup the sleep state\n");
1816 pinctrl_init_device_debugfs(pctldev);
1821 mutex_destroy(&pctldev->mutex);
1823 return ERR_PTR(ret);
1825 EXPORT_SYMBOL_GPL(pinctrl_register);
1828 * pinctrl_unregister() - unregister pinmux
1829 * @pctldev: pin controller to unregister
1831 * Called by pinmux drivers to unregister a pinmux.
1833 void pinctrl_unregister(struct pinctrl_dev *pctldev)
1835 struct pinctrl_gpio_range *range, *n;
1836 if (pctldev == NULL)
1839 mutex_lock(&pctldev->mutex);
1840 pinctrl_remove_device_debugfs(pctldev);
1841 mutex_unlock(&pctldev->mutex);
1843 if (!IS_ERR(pctldev->p))
1844 pinctrl_put(pctldev->p);
1846 mutex_lock(&pinctrldev_list_mutex);
1847 mutex_lock(&pctldev->mutex);
1848 /* TODO: check that no pinmuxes are still active? */
1849 list_del(&pctldev->node);
1850 /* Destroy descriptor tree */
1851 pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
1852 pctldev->desc->npins);
1853 /* remove gpio ranges map */
1854 list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node)
1855 list_del(&range->node);
1857 mutex_unlock(&pctldev->mutex);
1858 mutex_destroy(&pctldev->mutex);
1860 mutex_unlock(&pinctrldev_list_mutex);
1862 EXPORT_SYMBOL_GPL(pinctrl_unregister);
1864 static int __init pinctrl_init(void)
1866 pr_info("initialized pinctrl subsystem\n");
1867 pinctrl_init_debugfs();
1871 /* init early since many drivers really need to initialized pinmux early */
1872 core_initcall(pinctrl_init);