1 // SPDX-License-Identifier: GPL-2.0-only
3 * Core driver for the pin control subsystem
5 * Copyright (C) 2011-2012 ST-Ericsson SA
6 * Written on behalf of Linaro for ST-Ericsson
7 * Based on bits of regulator core, gpio core and clk core
9 * Author: Linus Walleij <linus.walleij@linaro.org>
11 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
13 #define pr_fmt(fmt) "pinctrl core: " fmt
15 #include <linux/kernel.h>
16 #include <linux/kref.h>
17 #include <linux/export.h>
18 #include <linux/init.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/err.h>
22 #include <linux/list.h>
23 #include <linux/debugfs.h>
24 #include <linux/seq_file.h>
25 #include <linux/pinctrl/consumer.h>
26 #include <linux/pinctrl/pinctrl.h>
27 #include <linux/pinctrl/machine.h>
30 #include <asm-generic/gpio.h>
34 #include "devicetree.h"
39 static bool pinctrl_dummy_state;
41 /* Mutex taken to protect pinctrl_list */
42 static DEFINE_MUTEX(pinctrl_list_mutex);
44 /* Mutex taken to protect pinctrl_maps */
45 DEFINE_MUTEX(pinctrl_maps_mutex);
47 /* Mutex taken to protect pinctrldev_list */
48 static DEFINE_MUTEX(pinctrldev_list_mutex);
50 /* Global list of pin control devices (struct pinctrl_dev) */
51 static LIST_HEAD(pinctrldev_list);
53 /* List of pin controller handles (struct pinctrl) */
54 static LIST_HEAD(pinctrl_list);
56 /* List of pinctrl maps (struct pinctrl_maps) */
57 LIST_HEAD(pinctrl_maps);
61 * pinctrl_provide_dummies() - indicate if pinctrl provides dummy state support
63 * Usually this function is called by platforms without pinctrl driver support
64 * but run with some shared drivers using pinctrl APIs.
65 * After calling this function, the pinctrl core will return successfully
66 * with creating a dummy state for the driver to keep going smoothly.
68 void pinctrl_provide_dummies(void)
70 pinctrl_dummy_state = true;
73 const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev)
75 /* We're not allowed to register devices without name */
76 return pctldev->desc->name;
78 EXPORT_SYMBOL_GPL(pinctrl_dev_get_name);
80 const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev)
82 return dev_name(pctldev->dev);
84 EXPORT_SYMBOL_GPL(pinctrl_dev_get_devname);
86 void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev)
88 return pctldev->driver_data;
90 EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata);
93 * get_pinctrl_dev_from_devname() - look up pin controller device
94 * @devname: the name of a device instance, as returned by dev_name()
96 * Looks up a pin control device matching a certain device name or pure device
97 * pointer, the pure device pointer will take precedence.
99 struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname)
101 struct pinctrl_dev *pctldev;
106 mutex_lock(&pinctrldev_list_mutex);
108 list_for_each_entry(pctldev, &pinctrldev_list, node) {
109 if (!strcmp(dev_name(pctldev->dev), devname)) {
110 /* Matched on device name */
111 mutex_unlock(&pinctrldev_list_mutex);
116 mutex_unlock(&pinctrldev_list_mutex);
121 struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np)
123 struct pinctrl_dev *pctldev;
125 mutex_lock(&pinctrldev_list_mutex);
127 list_for_each_entry(pctldev, &pinctrldev_list, node)
128 if (pctldev->dev->of_node == np) {
129 mutex_unlock(&pinctrldev_list_mutex);
133 mutex_unlock(&pinctrldev_list_mutex);
139 * pin_get_from_name() - look up a pin number from a name
140 * @pctldev: the pin control device to lookup the pin on
141 * @name: the name of the pin to look up
143 int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name)
147 /* The pin number can be retrived from the pin controller descriptor */
148 for (i = 0; i < pctldev->desc->npins; i++) {
149 struct pin_desc *desc;
151 pin = pctldev->desc->pins[i].number;
152 desc = pin_desc_get(pctldev, pin);
153 /* Pin space may be sparse */
154 if (desc && !strcmp(name, desc->name))
162 * pin_get_name_from_id() - look up a pin name from a pin id
163 * @pctldev: the pin control device to lookup the pin on
164 * @name: the name of the pin to look up
166 const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin)
168 const struct pin_desc *desc;
170 desc = pin_desc_get(pctldev, pin);
172 dev_err(pctldev->dev, "failed to get pin(%d) name\n",
179 EXPORT_SYMBOL_GPL(pin_get_name);
181 /* Deletes a range of pin descriptors */
182 static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev,
183 const struct pinctrl_pin_desc *pins,
188 for (i = 0; i < num_pins; i++) {
189 struct pin_desc *pindesc;
191 pindesc = radix_tree_lookup(&pctldev->pin_desc_tree,
194 radix_tree_delete(&pctldev->pin_desc_tree,
196 if (pindesc->dynamic_name)
197 kfree(pindesc->name);
203 static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
204 const struct pinctrl_pin_desc *pin)
206 struct pin_desc *pindesc;
208 pindesc = pin_desc_get(pctldev, pin->number);
210 dev_err(pctldev->dev, "pin %d already registered\n",
215 pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL);
220 pindesc->pctldev = pctldev;
222 /* Copy basic pin info */
224 pindesc->name = pin->name;
226 pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", pin->number);
227 if (!pindesc->name) {
231 pindesc->dynamic_name = true;
234 pindesc->drv_data = pin->drv_data;
236 radix_tree_insert(&pctldev->pin_desc_tree, pin->number, pindesc);
237 pr_debug("registered pin %d (%s) on %s\n",
238 pin->number, pindesc->name, pctldev->desc->name);
242 static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
243 const struct pinctrl_pin_desc *pins,
249 for (i = 0; i < num_descs; i++) {
250 ret = pinctrl_register_one_pin(pctldev, &pins[i]);
259 * gpio_to_pin() - GPIO range GPIO number to pin number translation
260 * @range: GPIO range used for the translation
261 * @gpio: gpio pin to translate to a pin number
263 * Finds the pin number for a given GPIO using the specified GPIO range
264 * as a base for translation. The distinction between linear GPIO ranges
265 * and pin list based GPIO ranges is managed correctly by this function.
267 * This function assumes the gpio is part of the specified GPIO range, use
268 * only after making sure this is the case (e.g. by calling it on the
269 * result of successful pinctrl_get_device_gpio_range calls)!
271 static inline int gpio_to_pin(struct pinctrl_gpio_range *range,
274 unsigned int offset = gpio - range->base;
276 return range->pins[offset];
278 return range->pin_base + offset;
282 * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
283 * @pctldev: pin controller device to check
284 * @gpio: gpio pin to check taken from the global GPIO pin space
286 * Tries to match a GPIO pin number to the ranges handled by a certain pin
287 * controller, return the range or NULL
289 static struct pinctrl_gpio_range *
290 pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
292 struct pinctrl_gpio_range *range;
294 mutex_lock(&pctldev->mutex);
295 /* Loop over the ranges */
296 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
297 /* Check if we're in the valid range */
298 if (gpio >= range->base &&
299 gpio < range->base + range->npins) {
300 mutex_unlock(&pctldev->mutex);
304 mutex_unlock(&pctldev->mutex);
309 * pinctrl_ready_for_gpio_range() - check if other GPIO pins of
310 * the same GPIO chip are in range
311 * @gpio: gpio pin to check taken from the global GPIO pin space
313 * This function is complement of pinctrl_match_gpio_range(). If the return
314 * value of pinctrl_match_gpio_range() is NULL, this function could be used
315 * to check whether pinctrl device is ready or not. Maybe some GPIO pins
316 * of the same GPIO chip don't have back-end pinctrl interface.
317 * If the return value is true, it means that pinctrl device is ready & the
318 * certain GPIO pin doesn't have back-end pinctrl device. If the return value
319 * is false, it means that pinctrl device may not be ready.
321 #ifdef CONFIG_GPIOLIB
322 static bool pinctrl_ready_for_gpio_range(unsigned gpio)
324 struct pinctrl_dev *pctldev;
325 struct pinctrl_gpio_range *range = NULL;
326 struct gpio_chip *chip = gpio_to_chip(gpio);
328 if (WARN(!chip, "no gpio_chip for gpio%i?", gpio))
331 mutex_lock(&pinctrldev_list_mutex);
333 /* Loop over the pin controllers */
334 list_for_each_entry(pctldev, &pinctrldev_list, node) {
335 /* Loop over the ranges */
336 mutex_lock(&pctldev->mutex);
337 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
338 /* Check if any gpio range overlapped with gpio chip */
339 if (range->base + range->npins - 1 < chip->base ||
340 range->base > chip->base + chip->ngpio - 1)
342 mutex_unlock(&pctldev->mutex);
343 mutex_unlock(&pinctrldev_list_mutex);
346 mutex_unlock(&pctldev->mutex);
349 mutex_unlock(&pinctrldev_list_mutex);
354 static bool pinctrl_ready_for_gpio_range(unsigned gpio) { return true; }
358 * pinctrl_get_device_gpio_range() - find device for GPIO range
359 * @gpio: the pin to locate the pin controller for
360 * @outdev: the pin control device if found
361 * @outrange: the GPIO range if found
363 * Find the pin controller handling a certain GPIO pin from the pinspace of
364 * the GPIO subsystem, return the device and the matching GPIO range. Returns
365 * -EPROBE_DEFER if the GPIO range could not be found in any device since it
366 * may still have not been registered.
368 static int pinctrl_get_device_gpio_range(unsigned gpio,
369 struct pinctrl_dev **outdev,
370 struct pinctrl_gpio_range **outrange)
372 struct pinctrl_dev *pctldev;
374 mutex_lock(&pinctrldev_list_mutex);
376 /* Loop over the pin controllers */
377 list_for_each_entry(pctldev, &pinctrldev_list, node) {
378 struct pinctrl_gpio_range *range;
380 range = pinctrl_match_gpio_range(pctldev, gpio);
384 mutex_unlock(&pinctrldev_list_mutex);
389 mutex_unlock(&pinctrldev_list_mutex);
391 return -EPROBE_DEFER;
395 * pinctrl_add_gpio_range() - register a GPIO range for a controller
396 * @pctldev: pin controller device to add the range to
397 * @range: the GPIO range to add
399 * This adds a range of GPIOs to be handled by a certain pin controller. Call
400 * this to register handled ranges after registering your pin controller.
402 void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
403 struct pinctrl_gpio_range *range)
405 mutex_lock(&pctldev->mutex);
406 list_add_tail(&range->node, &pctldev->gpio_ranges);
407 mutex_unlock(&pctldev->mutex);
409 EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
411 void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
412 struct pinctrl_gpio_range *ranges,
417 for (i = 0; i < nranges; i++)
418 pinctrl_add_gpio_range(pctldev, &ranges[i]);
420 EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges);
422 struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
423 struct pinctrl_gpio_range *range)
425 struct pinctrl_dev *pctldev;
427 pctldev = get_pinctrl_dev_from_devname(devname);
430 * If we can't find this device, let's assume that is because
431 * it has not probed yet, so the driver trying to register this
432 * range need to defer probing.
435 return ERR_PTR(-EPROBE_DEFER);
437 pinctrl_add_gpio_range(pctldev, range);
441 EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range);
443 int pinctrl_get_group_pins(struct pinctrl_dev *pctldev, const char *pin_group,
444 const unsigned **pins, unsigned *num_pins)
446 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
449 if (!pctlops->get_group_pins)
452 gs = pinctrl_get_group_selector(pctldev, pin_group);
456 return pctlops->get_group_pins(pctldev, gs, pins, num_pins);
458 EXPORT_SYMBOL_GPL(pinctrl_get_group_pins);
460 struct pinctrl_gpio_range *
461 pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev,
464 struct pinctrl_gpio_range *range;
466 /* Loop over the ranges */
467 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
468 /* Check if we're in the valid range */
471 for (a = 0; a < range->npins; a++) {
472 if (range->pins[a] == pin)
475 } else if (pin >= range->pin_base &&
476 pin < range->pin_base + range->npins)
482 EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin_nolock);
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 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin);
497 mutex_unlock(&pctldev->mutex);
501 EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin);
504 * pinctrl_remove_gpio_range() - remove a range of GPIOs from a pin controller
505 * @pctldev: pin controller device to remove the range from
506 * @range: the GPIO range to remove
508 void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
509 struct pinctrl_gpio_range *range)
511 mutex_lock(&pctldev->mutex);
512 list_del(&range->node);
513 mutex_unlock(&pctldev->mutex);
515 EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range);
517 #ifdef CONFIG_GENERIC_PINCTRL_GROUPS
520 * pinctrl_generic_get_group_count() - returns the number of pin groups
521 * @pctldev: pin controller device
523 int pinctrl_generic_get_group_count(struct pinctrl_dev *pctldev)
525 return pctldev->num_groups;
527 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_count);
530 * pinctrl_generic_get_group_name() - returns the name of a pin group
531 * @pctldev: pin controller device
532 * @selector: group number
534 const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev,
535 unsigned int selector)
537 struct group_desc *group;
539 group = radix_tree_lookup(&pctldev->pin_group_tree,
546 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_name);
549 * pinctrl_generic_get_group_pins() - gets the pin group pins
550 * @pctldev: pin controller device
551 * @selector: group number
552 * @pins: pins in the group
553 * @num_pins: number of pins in the group
555 int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev,
556 unsigned int selector,
557 const unsigned int **pins,
558 unsigned int *num_pins)
560 struct group_desc *group;
562 group = radix_tree_lookup(&pctldev->pin_group_tree,
565 dev_err(pctldev->dev, "%s could not find pingroup%i\n",
571 *num_pins = group->num_pins;
575 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_pins);
578 * pinctrl_generic_get_group() - returns a pin group based on the number
579 * @pctldev: pin controller device
580 * @gselector: group number
582 struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev,
583 unsigned int selector)
585 struct group_desc *group;
587 group = radix_tree_lookup(&pctldev->pin_group_tree,
594 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group);
596 static int pinctrl_generic_group_name_to_selector(struct pinctrl_dev *pctldev,
597 const char *function)
599 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
600 int ngroups = ops->get_groups_count(pctldev);
603 /* See if this pctldev has this group */
604 while (selector < ngroups) {
605 const char *gname = ops->get_group_name(pctldev, selector);
607 if (gname && !strcmp(function, gname))
617 * pinctrl_generic_add_group() - adds a new pin group
618 * @pctldev: pin controller device
619 * @name: name of the pin group
620 * @pins: pins in the pin group
621 * @num_pins: number of pins in the pin group
622 * @data: pin controller driver specific data
624 * Note that the caller must take care of locking.
626 int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name,
627 int *pins, int num_pins, void *data)
629 struct group_desc *group;
635 selector = pinctrl_generic_group_name_to_selector(pctldev, name);
639 selector = pctldev->num_groups;
641 group = devm_kzalloc(pctldev->dev, sizeof(*group), GFP_KERNEL);
647 group->num_pins = num_pins;
650 radix_tree_insert(&pctldev->pin_group_tree, selector, group);
652 pctldev->num_groups++;
656 EXPORT_SYMBOL_GPL(pinctrl_generic_add_group);
659 * pinctrl_generic_remove_group() - removes a numbered pin group
660 * @pctldev: pin controller device
661 * @selector: group number
663 * Note that the caller must take care of locking.
665 int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev,
666 unsigned int selector)
668 struct group_desc *group;
670 group = radix_tree_lookup(&pctldev->pin_group_tree,
675 radix_tree_delete(&pctldev->pin_group_tree, selector);
676 devm_kfree(pctldev->dev, group);
678 pctldev->num_groups--;
682 EXPORT_SYMBOL_GPL(pinctrl_generic_remove_group);
685 * pinctrl_generic_free_groups() - removes all pin groups
686 * @pctldev: pin controller device
688 * Note that the caller must take care of locking. The pinctrl groups
689 * are allocated with devm_kzalloc() so no need to free them here.
691 static void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev)
693 struct radix_tree_iter iter;
696 radix_tree_for_each_slot(slot, &pctldev->pin_group_tree, &iter, 0)
697 radix_tree_delete(&pctldev->pin_group_tree, iter.index);
699 pctldev->num_groups = 0;
703 static inline void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev)
706 #endif /* CONFIG_GENERIC_PINCTRL_GROUPS */
709 * pinctrl_get_group_selector() - returns the group selector for a group
710 * @pctldev: the pin controller handling the group
711 * @pin_group: the pin group to look up
713 int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
714 const char *pin_group)
716 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
717 unsigned ngroups = pctlops->get_groups_count(pctldev);
718 unsigned group_selector = 0;
720 while (group_selector < ngroups) {
721 const char *gname = pctlops->get_group_name(pctldev,
723 if (gname && !strcmp(gname, pin_group)) {
724 dev_dbg(pctldev->dev,
725 "found group selector %u for %s\n",
728 return group_selector;
734 dev_err(pctldev->dev, "does not have pin group %s\n",
740 bool pinctrl_gpio_can_use_line(unsigned gpio)
742 struct pinctrl_dev *pctldev;
743 struct pinctrl_gpio_range *range;
748 * Try to obtain GPIO range, if it fails
749 * we're probably dealing with GPIO driver
750 * without a backing pin controller - bail out.
752 if (pinctrl_get_device_gpio_range(gpio, &pctldev, &range))
755 mutex_lock(&pctldev->mutex);
757 /* Convert to the pin controllers number space */
758 pin = gpio_to_pin(range, gpio);
760 result = pinmux_can_be_used_for_gpio(pctldev, pin);
762 mutex_unlock(&pctldev->mutex);
766 EXPORT_SYMBOL_GPL(pinctrl_gpio_can_use_line);
769 * pinctrl_gpio_request() - request a single pin to be used as GPIO
770 * @gpio: the GPIO pin number from the GPIO subsystem number space
772 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
773 * as part of their gpio_request() semantics, platforms and individual drivers
774 * shall *NOT* request GPIO pins to be muxed in.
776 int pinctrl_gpio_request(unsigned gpio)
778 struct pinctrl_dev *pctldev;
779 struct pinctrl_gpio_range *range;
783 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
785 if (pinctrl_ready_for_gpio_range(gpio))
790 mutex_lock(&pctldev->mutex);
792 /* Convert to the pin controllers number space */
793 pin = gpio_to_pin(range, gpio);
795 ret = pinmux_request_gpio(pctldev, range, pin, gpio);
797 mutex_unlock(&pctldev->mutex);
801 EXPORT_SYMBOL_GPL(pinctrl_gpio_request);
804 * pinctrl_gpio_free() - free control on a single pin, currently used as GPIO
805 * @gpio: the GPIO pin number from the GPIO subsystem number space
807 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
808 * as part of their gpio_free() semantics, platforms and individual drivers
809 * shall *NOT* request GPIO pins to be muxed out.
811 void pinctrl_gpio_free(unsigned gpio)
813 struct pinctrl_dev *pctldev;
814 struct pinctrl_gpio_range *range;
818 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
822 mutex_lock(&pctldev->mutex);
824 /* Convert to the pin controllers number space */
825 pin = gpio_to_pin(range, gpio);
827 pinmux_free_gpio(pctldev, pin, range);
829 mutex_unlock(&pctldev->mutex);
831 EXPORT_SYMBOL_GPL(pinctrl_gpio_free);
833 static int pinctrl_gpio_direction(unsigned gpio, bool input)
835 struct pinctrl_dev *pctldev;
836 struct pinctrl_gpio_range *range;
840 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
845 mutex_lock(&pctldev->mutex);
847 /* Convert to the pin controllers number space */
848 pin = gpio_to_pin(range, gpio);
849 ret = pinmux_gpio_direction(pctldev, range, pin, input);
851 mutex_unlock(&pctldev->mutex);
857 * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode
858 * @gpio: the GPIO pin number from the GPIO subsystem number space
860 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
861 * as part of their gpio_direction_input() semantics, platforms and individual
862 * drivers shall *NOT* touch pin control GPIO calls.
864 int pinctrl_gpio_direction_input(unsigned gpio)
866 return pinctrl_gpio_direction(gpio, true);
868 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
871 * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode
872 * @gpio: the GPIO pin number from the GPIO subsystem number space
874 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
875 * as part of their gpio_direction_output() semantics, platforms and individual
876 * drivers shall *NOT* touch pin control GPIO calls.
878 int pinctrl_gpio_direction_output(unsigned gpio)
880 return pinctrl_gpio_direction(gpio, false);
882 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
885 * pinctrl_gpio_set_config() - Apply config to given GPIO pin
886 * @gpio: the GPIO pin number from the GPIO subsystem number space
887 * @config: the configuration to apply to the GPIO
889 * This function should *ONLY* be used from gpiolib-based GPIO drivers, if
890 * they need to call the underlying pin controller to change GPIO config
891 * (for example set debounce time).
893 int pinctrl_gpio_set_config(unsigned gpio, unsigned long config)
895 unsigned long configs[] = { config };
896 struct pinctrl_gpio_range *range;
897 struct pinctrl_dev *pctldev;
900 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
904 mutex_lock(&pctldev->mutex);
905 pin = gpio_to_pin(range, gpio);
906 ret = pinconf_set_config(pctldev, pin, configs, ARRAY_SIZE(configs));
907 mutex_unlock(&pctldev->mutex);
911 EXPORT_SYMBOL_GPL(pinctrl_gpio_set_config);
913 static struct pinctrl_state *find_state(struct pinctrl *p,
916 struct pinctrl_state *state;
918 list_for_each_entry(state, &p->states, node)
919 if (!strcmp(state->name, name))
925 static struct pinctrl_state *create_state(struct pinctrl *p,
928 struct pinctrl_state *state;
930 state = kzalloc(sizeof(*state), GFP_KERNEL);
932 return ERR_PTR(-ENOMEM);
935 INIT_LIST_HEAD(&state->settings);
937 list_add_tail(&state->node, &p->states);
942 static int add_setting(struct pinctrl *p, struct pinctrl_dev *pctldev,
943 const struct pinctrl_map *map)
945 struct pinctrl_state *state;
946 struct pinctrl_setting *setting;
949 state = find_state(p, map->name);
951 state = create_state(p, map->name);
953 return PTR_ERR(state);
955 if (map->type == PIN_MAP_TYPE_DUMMY_STATE)
958 setting = kzalloc(sizeof(*setting), GFP_KERNEL);
962 setting->type = map->type;
965 setting->pctldev = pctldev;
968 get_pinctrl_dev_from_devname(map->ctrl_dev_name);
969 if (!setting->pctldev) {
971 /* Do not defer probing of hogs (circular loop) */
972 if (!strcmp(map->ctrl_dev_name, map->dev_name))
975 * OK let us guess that the driver is not there yet, and
976 * let's defer obtaining this pinctrl handle to later...
978 dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe",
980 return -EPROBE_DEFER;
983 setting->dev_name = map->dev_name;
986 case PIN_MAP_TYPE_MUX_GROUP:
987 ret = pinmux_map_to_setting(map, setting);
989 case PIN_MAP_TYPE_CONFIGS_PIN:
990 case PIN_MAP_TYPE_CONFIGS_GROUP:
991 ret = pinconf_map_to_setting(map, setting);
1002 list_add_tail(&setting->node, &state->settings);
1007 static struct pinctrl *find_pinctrl(struct device *dev)
1011 mutex_lock(&pinctrl_list_mutex);
1012 list_for_each_entry(p, &pinctrl_list, node)
1013 if (p->dev == dev) {
1014 mutex_unlock(&pinctrl_list_mutex);
1018 mutex_unlock(&pinctrl_list_mutex);
1022 static void pinctrl_free(struct pinctrl *p, bool inlist);
1024 static struct pinctrl *create_pinctrl(struct device *dev,
1025 struct pinctrl_dev *pctldev)
1028 const char *devname;
1029 struct pinctrl_maps *maps_node;
1031 const struct pinctrl_map *map;
1035 * create the state cookie holder struct pinctrl for each
1036 * mapping, this is what consumers will get when requesting
1037 * a pin control handle with pinctrl_get()
1039 p = kzalloc(sizeof(*p), GFP_KERNEL);
1041 return ERR_PTR(-ENOMEM);
1043 INIT_LIST_HEAD(&p->states);
1044 INIT_LIST_HEAD(&p->dt_maps);
1046 ret = pinctrl_dt_to_map(p, pctldev);
1049 return ERR_PTR(ret);
1052 devname = dev_name(dev);
1054 mutex_lock(&pinctrl_maps_mutex);
1055 /* Iterate over the pin control maps to locate the right ones */
1056 for_each_maps(maps_node, i, map) {
1057 /* Map must be for this device */
1058 if (strcmp(map->dev_name, devname))
1061 * If pctldev is not null, we are claiming hog for it,
1062 * that means, setting that is served by pctldev by itself.
1064 * Thus we must skip map that is for this device but is served
1068 strcmp(dev_name(pctldev->dev), map->ctrl_dev_name))
1071 ret = add_setting(p, pctldev, map);
1073 * At this point the adding of a setting may:
1075 * - Defer, if the pinctrl device is not yet available
1076 * - Fail, if the pinctrl device is not yet available,
1077 * AND the setting is a hog. We cannot defer that, since
1078 * the hog will kick in immediately after the device
1081 * If the error returned was not -EPROBE_DEFER then we
1082 * accumulate the errors to see if we end up with
1083 * an -EPROBE_DEFER later, as that is the worst case.
1085 if (ret == -EPROBE_DEFER) {
1086 pinctrl_free(p, false);
1087 mutex_unlock(&pinctrl_maps_mutex);
1088 return ERR_PTR(ret);
1091 mutex_unlock(&pinctrl_maps_mutex);
1094 /* If some other error than deferral occurred, return here */
1095 pinctrl_free(p, false);
1096 return ERR_PTR(ret);
1099 kref_init(&p->users);
1101 /* Add the pinctrl handle to the global list */
1102 mutex_lock(&pinctrl_list_mutex);
1103 list_add_tail(&p->node, &pinctrl_list);
1104 mutex_unlock(&pinctrl_list_mutex);
1110 * pinctrl_get() - retrieves the pinctrl handle for a device
1111 * @dev: the device to obtain the handle for
1113 struct pinctrl *pinctrl_get(struct device *dev)
1118 return ERR_PTR(-EINVAL);
1121 * See if somebody else (such as the device core) has already
1122 * obtained a handle to the pinctrl for this device. In that case,
1123 * return another pointer to it.
1125 p = find_pinctrl(dev);
1127 dev_dbg(dev, "obtain a copy of previously claimed pinctrl\n");
1128 kref_get(&p->users);
1132 return create_pinctrl(dev, NULL);
1134 EXPORT_SYMBOL_GPL(pinctrl_get);
1136 static void pinctrl_free_setting(bool disable_setting,
1137 struct pinctrl_setting *setting)
1139 switch (setting->type) {
1140 case PIN_MAP_TYPE_MUX_GROUP:
1141 if (disable_setting)
1142 pinmux_disable_setting(setting);
1143 pinmux_free_setting(setting);
1145 case PIN_MAP_TYPE_CONFIGS_PIN:
1146 case PIN_MAP_TYPE_CONFIGS_GROUP:
1147 pinconf_free_setting(setting);
1154 static void pinctrl_free(struct pinctrl *p, bool inlist)
1156 struct pinctrl_state *state, *n1;
1157 struct pinctrl_setting *setting, *n2;
1159 mutex_lock(&pinctrl_list_mutex);
1160 list_for_each_entry_safe(state, n1, &p->states, node) {
1161 list_for_each_entry_safe(setting, n2, &state->settings, node) {
1162 pinctrl_free_setting(state == p->state, setting);
1163 list_del(&setting->node);
1166 list_del(&state->node);
1170 pinctrl_dt_free_maps(p);
1175 mutex_unlock(&pinctrl_list_mutex);
1179 * pinctrl_release() - release the pinctrl handle
1180 * @kref: the kref in the pinctrl being released
1182 static void pinctrl_release(struct kref *kref)
1184 struct pinctrl *p = container_of(kref, struct pinctrl, users);
1186 pinctrl_free(p, true);
1190 * pinctrl_put() - decrease use count on a previously claimed pinctrl handle
1191 * @p: the pinctrl handle to release
1193 void pinctrl_put(struct pinctrl *p)
1195 kref_put(&p->users, pinctrl_release);
1197 EXPORT_SYMBOL_GPL(pinctrl_put);
1200 * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle
1201 * @p: the pinctrl handle to retrieve the state from
1202 * @name: the state name to retrieve
1204 struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p,
1207 struct pinctrl_state *state;
1209 state = find_state(p, name);
1211 if (pinctrl_dummy_state) {
1212 /* create dummy state */
1213 dev_dbg(p->dev, "using pinctrl dummy state (%s)\n",
1215 state = create_state(p, name);
1217 state = ERR_PTR(-ENODEV);
1222 EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
1224 static void pinctrl_link_add(struct pinctrl_dev *pctldev,
1225 struct device *consumer)
1227 if (pctldev->desc->link_consumers)
1228 device_link_add(consumer, pctldev->dev,
1229 DL_FLAG_PM_RUNTIME |
1230 DL_FLAG_AUTOREMOVE_CONSUMER);
1234 * pinctrl_commit_state() - select/activate/program a pinctrl state to HW
1235 * @p: the pinctrl handle for the device that requests configuration
1236 * @state: the state handle to select/activate/program
1238 static int pinctrl_commit_state(struct pinctrl *p, struct pinctrl_state *state)
1240 struct pinctrl_setting *setting, *setting2;
1241 struct pinctrl_state *old_state = p->state;
1246 * For each pinmux setting in the old state, forget SW's record
1247 * of mux owner for that pingroup. Any pingroups which are
1248 * still owned by the new state will be re-acquired by the call
1249 * to pinmux_enable_setting() in the loop below.
1251 list_for_each_entry(setting, &p->state->settings, node) {
1252 if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
1254 pinmux_disable_setting(setting);
1260 /* Apply all the settings for the new state */
1261 list_for_each_entry(setting, &state->settings, node) {
1262 switch (setting->type) {
1263 case PIN_MAP_TYPE_MUX_GROUP:
1264 ret = pinmux_enable_setting(setting);
1266 case PIN_MAP_TYPE_CONFIGS_PIN:
1267 case PIN_MAP_TYPE_CONFIGS_GROUP:
1268 ret = pinconf_apply_setting(setting);
1276 goto unapply_new_state;
1279 /* Do not link hogs (circular dependency) */
1280 if (p != setting->pctldev->p)
1281 pinctrl_link_add(setting->pctldev, p->dev);
1289 dev_err(p->dev, "Error applying setting, reverse things back\n");
1291 list_for_each_entry(setting2, &state->settings, node) {
1292 if (&setting2->node == &setting->node)
1295 * All we can do here is pinmux_disable_setting.
1296 * That means that some pins are muxed differently now
1297 * than they were before applying the setting (We can't
1298 * "unmux a pin"!), but it's not a big deal since the pins
1299 * are free to be muxed by another apply_setting.
1301 if (setting2->type == PIN_MAP_TYPE_MUX_GROUP)
1302 pinmux_disable_setting(setting2);
1305 /* There's no infinite recursive loop here because p->state is NULL */
1307 pinctrl_select_state(p, old_state);
1313 * pinctrl_select_state() - select/activate/program a pinctrl state to HW
1314 * @p: the pinctrl handle for the device that requests configuration
1315 * @state: the state handle to select/activate/program
1317 int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
1319 if (p->state == state)
1322 return pinctrl_commit_state(p, state);
1324 EXPORT_SYMBOL_GPL(pinctrl_select_state);
1326 static void devm_pinctrl_release(struct device *dev, void *res)
1328 pinctrl_put(*(struct pinctrl **)res);
1332 * struct devm_pinctrl_get() - Resource managed pinctrl_get()
1333 * @dev: the device to obtain the handle for
1335 * If there is a need to explicitly destroy the returned struct pinctrl,
1336 * devm_pinctrl_put() should be used, rather than plain pinctrl_put().
1338 struct pinctrl *devm_pinctrl_get(struct device *dev)
1340 struct pinctrl **ptr, *p;
1342 ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL);
1344 return ERR_PTR(-ENOMEM);
1346 p = pinctrl_get(dev);
1349 devres_add(dev, ptr);
1356 EXPORT_SYMBOL_GPL(devm_pinctrl_get);
1358 static int devm_pinctrl_match(struct device *dev, void *res, void *data)
1360 struct pinctrl **p = res;
1366 * devm_pinctrl_put() - Resource managed pinctrl_put()
1367 * @p: the pinctrl handle to release
1369 * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally
1370 * this function will not need to be called and the resource management
1371 * code will ensure that the resource is freed.
1373 void devm_pinctrl_put(struct pinctrl *p)
1375 WARN_ON(devres_release(p->dev, devm_pinctrl_release,
1376 devm_pinctrl_match, p));
1378 EXPORT_SYMBOL_GPL(devm_pinctrl_put);
1381 * pinctrl_register_mappings() - register a set of pin controller mappings
1382 * @maps: the pincontrol mappings table to register. Note the pinctrl-core
1383 * keeps a reference to the passed in maps, so they should _not_ be
1384 * marked with __initdata.
1385 * @num_maps: the number of maps in the mapping table
1387 int pinctrl_register_mappings(const struct pinctrl_map *maps,
1391 struct pinctrl_maps *maps_node;
1393 pr_debug("add %u pinctrl maps\n", num_maps);
1395 /* First sanity check the new mapping */
1396 for (i = 0; i < num_maps; i++) {
1397 if (!maps[i].dev_name) {
1398 pr_err("failed to register map %s (%d): no device given\n",
1403 if (!maps[i].name) {
1404 pr_err("failed to register map %d: no map name given\n",
1409 if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE &&
1410 !maps[i].ctrl_dev_name) {
1411 pr_err("failed to register map %s (%d): no pin control device given\n",
1416 switch (maps[i].type) {
1417 case PIN_MAP_TYPE_DUMMY_STATE:
1419 case PIN_MAP_TYPE_MUX_GROUP:
1420 ret = pinmux_validate_map(&maps[i], i);
1424 case PIN_MAP_TYPE_CONFIGS_PIN:
1425 case PIN_MAP_TYPE_CONFIGS_GROUP:
1426 ret = pinconf_validate_map(&maps[i], i);
1431 pr_err("failed to register map %s (%d): invalid type given\n",
1437 maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL);
1441 maps_node->maps = maps;
1442 maps_node->num_maps = num_maps;
1444 mutex_lock(&pinctrl_maps_mutex);
1445 list_add_tail(&maps_node->node, &pinctrl_maps);
1446 mutex_unlock(&pinctrl_maps_mutex);
1450 EXPORT_SYMBOL_GPL(pinctrl_register_mappings);
1453 * pinctrl_unregister_mappings() - unregister a set of pin controller mappings
1454 * @maps: the pincontrol mappings table passed to pinctrl_register_mappings()
1455 * when registering the mappings.
1457 void pinctrl_unregister_mappings(const struct pinctrl_map *map)
1459 struct pinctrl_maps *maps_node;
1461 mutex_lock(&pinctrl_maps_mutex);
1462 list_for_each_entry(maps_node, &pinctrl_maps, node) {
1463 if (maps_node->maps == map) {
1464 list_del(&maps_node->node);
1466 mutex_unlock(&pinctrl_maps_mutex);
1470 mutex_unlock(&pinctrl_maps_mutex);
1472 EXPORT_SYMBOL_GPL(pinctrl_unregister_mappings);
1475 * pinctrl_force_sleep() - turn a given controller device into sleep state
1476 * @pctldev: pin controller device
1478 int pinctrl_force_sleep(struct pinctrl_dev *pctldev)
1480 if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_sleep))
1481 return pinctrl_commit_state(pctldev->p, pctldev->hog_sleep);
1484 EXPORT_SYMBOL_GPL(pinctrl_force_sleep);
1487 * pinctrl_force_default() - turn a given controller device into default state
1488 * @pctldev: pin controller device
1490 int pinctrl_force_default(struct pinctrl_dev *pctldev)
1492 if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_default))
1493 return pinctrl_commit_state(pctldev->p, pctldev->hog_default);
1496 EXPORT_SYMBOL_GPL(pinctrl_force_default);
1499 * pinctrl_init_done() - tell pinctrl probe is done
1501 * We'll use this time to switch the pins from "init" to "default" unless the
1502 * driver selected some other state.
1504 * @dev: device to that's done probing
1506 int pinctrl_init_done(struct device *dev)
1508 struct dev_pin_info *pins = dev->pins;
1514 if (IS_ERR(pins->init_state))
1515 return 0; /* No such state */
1517 if (pins->p->state != pins->init_state)
1518 return 0; /* Not at init anyway */
1520 if (IS_ERR(pins->default_state))
1521 return 0; /* No default state */
1523 ret = pinctrl_select_state(pins->p, pins->default_state);
1525 dev_err(dev, "failed to activate default pinctrl state\n");
1530 static int pinctrl_select_bound_state(struct device *dev,
1531 struct pinctrl_state *state)
1533 struct dev_pin_info *pins = dev->pins;
1537 return 0; /* No such state */
1538 ret = pinctrl_select_state(pins->p, state);
1540 dev_err(dev, "failed to activate pinctrl state %s\n",
1546 * pinctrl_select_default_state() - select default pinctrl state
1547 * @dev: device to select default state for
1549 int pinctrl_select_default_state(struct device *dev)
1554 return pinctrl_select_bound_state(dev, dev->pins->default_state);
1556 EXPORT_SYMBOL_GPL(pinctrl_select_default_state);
1561 * pinctrl_pm_select_default_state() - select default pinctrl state for PM
1562 * @dev: device to select default state for
1564 int pinctrl_pm_select_default_state(struct device *dev)
1566 return pinctrl_select_default_state(dev);
1568 EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state);
1571 * pinctrl_pm_select_sleep_state() - select sleep pinctrl state for PM
1572 * @dev: device to select sleep state for
1574 int pinctrl_pm_select_sleep_state(struct device *dev)
1579 return pinctrl_select_bound_state(dev, dev->pins->sleep_state);
1581 EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state);
1584 * pinctrl_pm_select_idle_state() - select idle pinctrl state for PM
1585 * @dev: device to select idle state for
1587 int pinctrl_pm_select_idle_state(struct device *dev)
1592 return pinctrl_select_bound_state(dev, dev->pins->idle_state);
1594 EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state);
1597 #ifdef CONFIG_DEBUG_FS
1599 static int pinctrl_pins_show(struct seq_file *s, void *what)
1601 struct pinctrl_dev *pctldev = s->private;
1602 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1605 seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
1607 mutex_lock(&pctldev->mutex);
1609 /* The pin number can be retrived from the pin controller descriptor */
1610 for (i = 0; i < pctldev->desc->npins; i++) {
1611 struct pin_desc *desc;
1613 pin = pctldev->desc->pins[i].number;
1614 desc = pin_desc_get(pctldev, pin);
1615 /* Pin space may be sparse */
1619 seq_printf(s, "pin %d (%s) ", pin, desc->name);
1621 /* Driver-specific info per pin */
1622 if (ops->pin_dbg_show)
1623 ops->pin_dbg_show(pctldev, s, pin);
1628 mutex_unlock(&pctldev->mutex);
1632 DEFINE_SHOW_ATTRIBUTE(pinctrl_pins);
1634 static int pinctrl_groups_show(struct seq_file *s, void *what)
1636 struct pinctrl_dev *pctldev = s->private;
1637 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1638 unsigned ngroups, selector = 0;
1640 mutex_lock(&pctldev->mutex);
1642 ngroups = ops->get_groups_count(pctldev);
1644 seq_puts(s, "registered pin groups:\n");
1645 while (selector < ngroups) {
1646 const unsigned *pins = NULL;
1647 unsigned num_pins = 0;
1648 const char *gname = ops->get_group_name(pctldev, selector);
1653 if (ops->get_group_pins)
1654 ret = ops->get_group_pins(pctldev, selector,
1657 seq_printf(s, "%s [ERROR GETTING PINS]\n",
1660 seq_printf(s, "group: %s\n", gname);
1661 for (i = 0; i < num_pins; i++) {
1662 pname = pin_get_name(pctldev, pins[i]);
1663 if (WARN_ON(!pname)) {
1664 mutex_unlock(&pctldev->mutex);
1667 seq_printf(s, "pin %d (%s)\n", pins[i], pname);
1674 mutex_unlock(&pctldev->mutex);
1678 DEFINE_SHOW_ATTRIBUTE(pinctrl_groups);
1680 static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
1682 struct pinctrl_dev *pctldev = s->private;
1683 struct pinctrl_gpio_range *range;
1685 seq_puts(s, "GPIO ranges handled:\n");
1687 mutex_lock(&pctldev->mutex);
1689 /* Loop over the ranges */
1690 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
1693 seq_printf(s, "%u: %s GPIOS [%u - %u] PINS {",
1694 range->id, range->name,
1695 range->base, (range->base + range->npins - 1));
1696 for (a = 0; a < range->npins - 1; a++)
1697 seq_printf(s, "%u, ", range->pins[a]);
1698 seq_printf(s, "%u}\n", range->pins[a]);
1701 seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
1702 range->id, range->name,
1703 range->base, (range->base + range->npins - 1),
1705 (range->pin_base + range->npins - 1));
1708 mutex_unlock(&pctldev->mutex);
1712 DEFINE_SHOW_ATTRIBUTE(pinctrl_gpioranges);
1714 static int pinctrl_devices_show(struct seq_file *s, void *what)
1716 struct pinctrl_dev *pctldev;
1718 seq_puts(s, "name [pinmux] [pinconf]\n");
1720 mutex_lock(&pinctrldev_list_mutex);
1722 list_for_each_entry(pctldev, &pinctrldev_list, node) {
1723 seq_printf(s, "%s ", pctldev->desc->name);
1724 if (pctldev->desc->pmxops)
1725 seq_puts(s, "yes ");
1728 if (pctldev->desc->confops)
1735 mutex_unlock(&pinctrldev_list_mutex);
1739 DEFINE_SHOW_ATTRIBUTE(pinctrl_devices);
1741 static inline const char *map_type(enum pinctrl_map_type type)
1743 static const char * const names[] = {
1751 if (type >= ARRAY_SIZE(names))
1757 static int pinctrl_maps_show(struct seq_file *s, void *what)
1759 struct pinctrl_maps *maps_node;
1761 const struct pinctrl_map *map;
1763 seq_puts(s, "Pinctrl maps:\n");
1765 mutex_lock(&pinctrl_maps_mutex);
1766 for_each_maps(maps_node, i, map) {
1767 seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n",
1768 map->dev_name, map->name, map_type(map->type),
1771 if (map->type != PIN_MAP_TYPE_DUMMY_STATE)
1772 seq_printf(s, "controlling device %s\n",
1773 map->ctrl_dev_name);
1775 switch (map->type) {
1776 case PIN_MAP_TYPE_MUX_GROUP:
1777 pinmux_show_map(s, map);
1779 case PIN_MAP_TYPE_CONFIGS_PIN:
1780 case PIN_MAP_TYPE_CONFIGS_GROUP:
1781 pinconf_show_map(s, map);
1789 mutex_unlock(&pinctrl_maps_mutex);
1793 DEFINE_SHOW_ATTRIBUTE(pinctrl_maps);
1795 static int pinctrl_show(struct seq_file *s, void *what)
1798 struct pinctrl_state *state;
1799 struct pinctrl_setting *setting;
1801 seq_puts(s, "Requested pin control handlers their pinmux maps:\n");
1803 mutex_lock(&pinctrl_list_mutex);
1805 list_for_each_entry(p, &pinctrl_list, node) {
1806 seq_printf(s, "device: %s current state: %s\n",
1808 p->state ? p->state->name : "none");
1810 list_for_each_entry(state, &p->states, node) {
1811 seq_printf(s, " state: %s\n", state->name);
1813 list_for_each_entry(setting, &state->settings, node) {
1814 struct pinctrl_dev *pctldev = setting->pctldev;
1816 seq_printf(s, " type: %s controller %s ",
1817 map_type(setting->type),
1818 pinctrl_dev_get_name(pctldev));
1820 switch (setting->type) {
1821 case PIN_MAP_TYPE_MUX_GROUP:
1822 pinmux_show_setting(s, setting);
1824 case PIN_MAP_TYPE_CONFIGS_PIN:
1825 case PIN_MAP_TYPE_CONFIGS_GROUP:
1826 pinconf_show_setting(s, setting);
1835 mutex_unlock(&pinctrl_list_mutex);
1839 DEFINE_SHOW_ATTRIBUTE(pinctrl);
1841 static struct dentry *debugfs_root;
1843 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1845 struct dentry *device_root;
1846 const char *debugfs_name;
1848 if (pctldev->desc->name &&
1849 strcmp(dev_name(pctldev->dev), pctldev->desc->name)) {
1850 debugfs_name = devm_kasprintf(pctldev->dev, GFP_KERNEL,
1851 "%s-%s", dev_name(pctldev->dev),
1852 pctldev->desc->name);
1853 if (!debugfs_name) {
1854 pr_warn("failed to determine debugfs dir name for %s\n",
1855 dev_name(pctldev->dev));
1859 debugfs_name = dev_name(pctldev->dev);
1862 device_root = debugfs_create_dir(debugfs_name, debugfs_root);
1863 pctldev->device_root = device_root;
1865 if (IS_ERR(device_root) || !device_root) {
1866 pr_warn("failed to create debugfs directory for %s\n",
1867 dev_name(pctldev->dev));
1870 debugfs_create_file("pins", S_IFREG | S_IRUGO,
1871 device_root, pctldev, &pinctrl_pins_fops);
1872 debugfs_create_file("pingroups", S_IFREG | S_IRUGO,
1873 device_root, pctldev, &pinctrl_groups_fops);
1874 debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO,
1875 device_root, pctldev, &pinctrl_gpioranges_fops);
1876 if (pctldev->desc->pmxops)
1877 pinmux_init_device_debugfs(device_root, pctldev);
1878 if (pctldev->desc->confops)
1879 pinconf_init_device_debugfs(device_root, pctldev);
1882 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1884 debugfs_remove_recursive(pctldev->device_root);
1887 static void pinctrl_init_debugfs(void)
1889 debugfs_root = debugfs_create_dir("pinctrl", NULL);
1890 if (IS_ERR(debugfs_root) || !debugfs_root) {
1891 pr_warn("failed to create debugfs directory\n");
1892 debugfs_root = NULL;
1896 debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO,
1897 debugfs_root, NULL, &pinctrl_devices_fops);
1898 debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO,
1899 debugfs_root, NULL, &pinctrl_maps_fops);
1900 debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO,
1901 debugfs_root, NULL, &pinctrl_fops);
1904 #else /* CONFIG_DEBUG_FS */
1906 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1910 static void pinctrl_init_debugfs(void)
1914 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1920 static int pinctrl_check_ops(struct pinctrl_dev *pctldev)
1922 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1925 !ops->get_groups_count ||
1926 !ops->get_group_name)
1933 * pinctrl_init_controller() - init a pin controller device
1934 * @pctldesc: descriptor for this pin controller
1935 * @dev: parent device for this pin controller
1936 * @driver_data: private pin controller data for this pin controller
1938 static struct pinctrl_dev *
1939 pinctrl_init_controller(struct pinctrl_desc *pctldesc, struct device *dev,
1942 struct pinctrl_dev *pctldev;
1946 return ERR_PTR(-EINVAL);
1947 if (!pctldesc->name)
1948 return ERR_PTR(-EINVAL);
1950 pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL);
1952 return ERR_PTR(-ENOMEM);
1954 /* Initialize pin control device struct */
1955 pctldev->owner = pctldesc->owner;
1956 pctldev->desc = pctldesc;
1957 pctldev->driver_data = driver_data;
1958 INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
1959 #ifdef CONFIG_GENERIC_PINCTRL_GROUPS
1960 INIT_RADIX_TREE(&pctldev->pin_group_tree, GFP_KERNEL);
1962 #ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS
1963 INIT_RADIX_TREE(&pctldev->pin_function_tree, GFP_KERNEL);
1965 INIT_LIST_HEAD(&pctldev->gpio_ranges);
1966 INIT_LIST_HEAD(&pctldev->node);
1968 mutex_init(&pctldev->mutex);
1970 /* check core ops for sanity */
1971 ret = pinctrl_check_ops(pctldev);
1973 dev_err(dev, "pinctrl ops lacks necessary functions\n");
1977 /* If we're implementing pinmuxing, check the ops for sanity */
1978 if (pctldesc->pmxops) {
1979 ret = pinmux_check_ops(pctldev);
1984 /* If we're implementing pinconfig, check the ops for sanity */
1985 if (pctldesc->confops) {
1986 ret = pinconf_check_ops(pctldev);
1991 /* Register all the pins */
1992 dev_dbg(dev, "try to register %d pins ...\n", pctldesc->npins);
1993 ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins);
1995 dev_err(dev, "error during pin registration\n");
1996 pinctrl_free_pindescs(pctldev, pctldesc->pins,
2004 mutex_destroy(&pctldev->mutex);
2006 return ERR_PTR(ret);
2009 static int pinctrl_claim_hogs(struct pinctrl_dev *pctldev)
2011 pctldev->p = create_pinctrl(pctldev->dev, pctldev);
2012 if (PTR_ERR(pctldev->p) == -ENODEV) {
2013 dev_dbg(pctldev->dev, "no hogs found\n");
2018 if (IS_ERR(pctldev->p)) {
2019 dev_err(pctldev->dev, "error claiming hogs: %li\n",
2020 PTR_ERR(pctldev->p));
2022 return PTR_ERR(pctldev->p);
2025 kref_get(&pctldev->p->users);
2026 pctldev->hog_default =
2027 pinctrl_lookup_state(pctldev->p, PINCTRL_STATE_DEFAULT);
2028 if (IS_ERR(pctldev->hog_default)) {
2029 dev_dbg(pctldev->dev,
2030 "failed to lookup the default state\n");
2032 if (pinctrl_select_state(pctldev->p,
2033 pctldev->hog_default))
2034 dev_err(pctldev->dev,
2035 "failed to select default state\n");
2038 pctldev->hog_sleep =
2039 pinctrl_lookup_state(pctldev->p,
2040 PINCTRL_STATE_SLEEP);
2041 if (IS_ERR(pctldev->hog_sleep))
2042 dev_dbg(pctldev->dev,
2043 "failed to lookup the sleep state\n");
2048 int pinctrl_enable(struct pinctrl_dev *pctldev)
2052 error = pinctrl_claim_hogs(pctldev);
2054 dev_err(pctldev->dev, "could not claim hogs: %i\n",
2056 mutex_destroy(&pctldev->mutex);
2062 mutex_lock(&pinctrldev_list_mutex);
2063 list_add_tail(&pctldev->node, &pinctrldev_list);
2064 mutex_unlock(&pinctrldev_list_mutex);
2066 pinctrl_init_device_debugfs(pctldev);
2070 EXPORT_SYMBOL_GPL(pinctrl_enable);
2073 * pinctrl_register() - register a pin controller device
2074 * @pctldesc: descriptor for this pin controller
2075 * @dev: parent device for this pin controller
2076 * @driver_data: private pin controller data for this pin controller
2078 * Note that pinctrl_register() is known to have problems as the pin
2079 * controller driver functions are called before the driver has a
2080 * struct pinctrl_dev handle. To avoid issues later on, please use the
2081 * new pinctrl_register_and_init() below instead.
2083 struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
2084 struct device *dev, void *driver_data)
2086 struct pinctrl_dev *pctldev;
2089 pctldev = pinctrl_init_controller(pctldesc, dev, driver_data);
2090 if (IS_ERR(pctldev))
2093 error = pinctrl_enable(pctldev);
2095 return ERR_PTR(error);
2100 EXPORT_SYMBOL_GPL(pinctrl_register);
2103 * pinctrl_register_and_init() - register and init pin controller device
2104 * @pctldesc: descriptor for this pin controller
2105 * @dev: parent device for this pin controller
2106 * @driver_data: private pin controller data for this pin controller
2107 * @pctldev: pin controller device
2109 * Note that pinctrl_enable() still needs to be manually called after
2110 * this once the driver is ready.
2112 int pinctrl_register_and_init(struct pinctrl_desc *pctldesc,
2113 struct device *dev, void *driver_data,
2114 struct pinctrl_dev **pctldev)
2116 struct pinctrl_dev *p;
2118 p = pinctrl_init_controller(pctldesc, dev, driver_data);
2123 * We have pinctrl_start() call functions in the pin controller
2124 * driver with create_pinctrl() for at least dt_node_to_map(). So
2125 * let's make sure pctldev is properly initialized for the
2126 * pin controller driver before we do anything.
2132 EXPORT_SYMBOL_GPL(pinctrl_register_and_init);
2135 * pinctrl_unregister() - unregister pinmux
2136 * @pctldev: pin controller to unregister
2138 * Called by pinmux drivers to unregister a pinmux.
2140 void pinctrl_unregister(struct pinctrl_dev *pctldev)
2142 struct pinctrl_gpio_range *range, *n;
2147 mutex_lock(&pctldev->mutex);
2148 pinctrl_remove_device_debugfs(pctldev);
2149 mutex_unlock(&pctldev->mutex);
2151 if (!IS_ERR_OR_NULL(pctldev->p))
2152 pinctrl_put(pctldev->p);
2154 mutex_lock(&pinctrldev_list_mutex);
2155 mutex_lock(&pctldev->mutex);
2156 /* TODO: check that no pinmuxes are still active? */
2157 list_del(&pctldev->node);
2158 pinmux_generic_free_functions(pctldev);
2159 pinctrl_generic_free_groups(pctldev);
2160 /* Destroy descriptor tree */
2161 pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
2162 pctldev->desc->npins);
2163 /* remove gpio ranges map */
2164 list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node)
2165 list_del(&range->node);
2167 mutex_unlock(&pctldev->mutex);
2168 mutex_destroy(&pctldev->mutex);
2170 mutex_unlock(&pinctrldev_list_mutex);
2172 EXPORT_SYMBOL_GPL(pinctrl_unregister);
2174 static void devm_pinctrl_dev_release(struct device *dev, void *res)
2176 struct pinctrl_dev *pctldev = *(struct pinctrl_dev **)res;
2178 pinctrl_unregister(pctldev);
2181 static int devm_pinctrl_dev_match(struct device *dev, void *res, void *data)
2183 struct pctldev **r = res;
2185 if (WARN_ON(!r || !*r))
2192 * devm_pinctrl_register() - Resource managed version of pinctrl_register().
2193 * @dev: parent device for this pin controller
2194 * @pctldesc: descriptor for this pin controller
2195 * @driver_data: private pin controller data for this pin controller
2197 * Returns an error pointer if pincontrol register failed. Otherwise
2198 * it returns valid pinctrl handle.
2200 * The pinctrl device will be automatically released when the device is unbound.
2202 struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
2203 struct pinctrl_desc *pctldesc,
2206 struct pinctrl_dev **ptr, *pctldev;
2208 ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL);
2210 return ERR_PTR(-ENOMEM);
2212 pctldev = pinctrl_register(pctldesc, dev, driver_data);
2213 if (IS_ERR(pctldev)) {
2219 devres_add(dev, ptr);
2223 EXPORT_SYMBOL_GPL(devm_pinctrl_register);
2226 * devm_pinctrl_register_and_init() - Resource managed pinctrl register and init
2227 * @dev: parent device for this pin controller
2228 * @pctldesc: descriptor for this pin controller
2229 * @driver_data: private pin controller data for this pin controller
2231 * Returns an error pointer if pincontrol register failed. Otherwise
2232 * it returns valid pinctrl handle.
2234 * The pinctrl device will be automatically released when the device is unbound.
2236 int devm_pinctrl_register_and_init(struct device *dev,
2237 struct pinctrl_desc *pctldesc,
2239 struct pinctrl_dev **pctldev)
2241 struct pinctrl_dev **ptr;
2244 ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL);
2248 error = pinctrl_register_and_init(pctldesc, dev, driver_data, pctldev);
2255 devres_add(dev, ptr);
2259 EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init);
2262 * devm_pinctrl_unregister() - Resource managed version of pinctrl_unregister().
2263 * @dev: device for which which resource was allocated
2264 * @pctldev: the pinctrl device to unregister.
2266 void devm_pinctrl_unregister(struct device *dev, struct pinctrl_dev *pctldev)
2268 WARN_ON(devres_release(dev, devm_pinctrl_dev_release,
2269 devm_pinctrl_dev_match, pctldev));
2271 EXPORT_SYMBOL_GPL(devm_pinctrl_unregister);
2273 static int __init pinctrl_init(void)
2275 pr_info("initialized pinctrl subsystem\n");
2276 pinctrl_init_debugfs();
2280 /* init early since many drivers really need to initialized pinmux early */
2281 core_initcall(pinctrl_init);