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/array_size.h>
16 #include <linux/cleanup.h>
17 #include <linux/debugfs.h>
18 #include <linux/device.h>
19 #include <linux/err.h>
20 #include <linux/export.h>
21 #include <linux/init.h>
22 #include <linux/kref.h>
23 #include <linux/list.h>
24 #include <linux/seq_file.h>
25 #include <linux/slab.h>
27 #include <linux/gpio.h>
28 #include <linux/gpio/driver.h>
30 #include <linux/pinctrl/consumer.h>
31 #include <linux/pinctrl/devinfo.h>
32 #include <linux/pinctrl/machine.h>
33 #include <linux/pinctrl/pinctrl.h>
36 #include "devicetree.h"
40 static bool pinctrl_dummy_state;
42 /* Mutex taken to protect pinctrl_list */
43 static DEFINE_MUTEX(pinctrl_list_mutex);
45 /* Mutex taken to protect pinctrl_maps */
46 DEFINE_MUTEX(pinctrl_maps_mutex);
48 /* Mutex taken to protect pinctrldev_list */
49 static DEFINE_MUTEX(pinctrldev_list_mutex);
51 /* Global list of pin control devices (struct pinctrl_dev) */
52 static LIST_HEAD(pinctrldev_list);
54 /* List of pin controller handles (struct pinctrl) */
55 static LIST_HEAD(pinctrl_list);
57 /* List of pinctrl maps (struct pinctrl_maps) */
58 LIST_HEAD(pinctrl_maps);
62 * pinctrl_provide_dummies() - indicate if pinctrl provides dummy state support
64 * Usually this function is called by platforms without pinctrl driver support
65 * but run with some shared drivers using pinctrl APIs.
66 * After calling this function, the pinctrl core will return successfully
67 * with creating a dummy state for the driver to keep going smoothly.
69 void pinctrl_provide_dummies(void)
71 pinctrl_dummy_state = true;
74 const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev)
76 /* We're not allowed to register devices without name */
77 return pctldev->desc->name;
79 EXPORT_SYMBOL_GPL(pinctrl_dev_get_name);
81 const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev)
83 return dev_name(pctldev->dev);
85 EXPORT_SYMBOL_GPL(pinctrl_dev_get_devname);
87 void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev)
89 return pctldev->driver_data;
91 EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata);
94 * get_pinctrl_dev_from_devname() - look up pin controller device
95 * @devname: the name of a device instance, as returned by dev_name()
97 * Looks up a pin control device matching a certain device name or pure device
98 * pointer, the pure device pointer will take precedence.
100 struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname)
102 struct pinctrl_dev *pctldev;
107 mutex_lock(&pinctrldev_list_mutex);
109 list_for_each_entry(pctldev, &pinctrldev_list, node) {
110 if (!strcmp(dev_name(pctldev->dev), devname)) {
111 /* Matched on device name */
112 mutex_unlock(&pinctrldev_list_mutex);
117 mutex_unlock(&pinctrldev_list_mutex);
122 struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np)
124 struct pinctrl_dev *pctldev;
126 mutex_lock(&pinctrldev_list_mutex);
128 list_for_each_entry(pctldev, &pinctrldev_list, node)
129 if (device_match_of_node(pctldev->dev, np)) {
130 mutex_unlock(&pinctrldev_list_mutex);
134 mutex_unlock(&pinctrldev_list_mutex);
140 * pin_get_from_name() - look up a pin number from a name
141 * @pctldev: the pin control device to lookup the pin on
142 * @name: the name of the pin to look up
144 int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name)
148 /* The pin number can be retrived from the pin controller descriptor */
149 for (i = 0; i < pctldev->desc->npins; i++) {
150 struct pin_desc *desc;
152 pin = pctldev->desc->pins[i].number;
153 desc = pin_desc_get(pctldev, pin);
154 /* Pin space may be sparse */
155 if (desc && !strcmp(name, desc->name))
163 * pin_get_name() - look up a pin name from a pin id
164 * @pctldev: the pin control device to lookup the pin on
165 * @pin: pin number/id to look up
167 const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned int pin)
169 const struct pin_desc *desc;
171 desc = pin_desc_get(pctldev, pin);
173 dev_err(pctldev->dev, "failed to get pin(%d) name\n",
180 EXPORT_SYMBOL_GPL(pin_get_name);
182 /* Deletes a range of pin descriptors */
183 static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev,
184 const struct pinctrl_pin_desc *pins,
185 unsigned int num_pins)
189 for (i = 0; i < num_pins; i++) {
190 struct pin_desc *pindesc;
192 pindesc = radix_tree_lookup(&pctldev->pin_desc_tree,
195 radix_tree_delete(&pctldev->pin_desc_tree,
197 if (pindesc->dynamic_name)
198 kfree(pindesc->name);
204 static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
205 const struct pinctrl_pin_desc *pin)
207 struct pin_desc *pindesc;
210 pindesc = pin_desc_get(pctldev, pin->number);
212 dev_err(pctldev->dev, "pin %d already registered\n",
217 pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL);
222 pindesc->pctldev = pctldev;
224 /* Copy basic pin info */
226 pindesc->name = pin->name;
228 pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", pin->number);
229 if (!pindesc->name) {
233 pindesc->dynamic_name = true;
236 pindesc->drv_data = pin->drv_data;
238 error = radix_tree_insert(&pctldev->pin_desc_tree, pin->number, pindesc);
242 pr_debug("registered pin %d (%s) on %s\n",
243 pin->number, pindesc->name, pctldev->desc->name);
251 static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
252 const struct pinctrl_pin_desc *pins,
253 unsigned int num_descs)
258 for (i = 0; i < num_descs; i++) {
259 ret = pinctrl_register_one_pin(pctldev, &pins[i]);
268 * gpio_to_pin() - GPIO range GPIO number to pin number translation
269 * @range: GPIO range used for the translation
270 * @gc: GPIO chip structure from the GPIO subsystem
271 * @offset: hardware offset of the GPIO relative to the controller
273 * Finds the pin number for a given GPIO using the specified GPIO range
274 * as a base for translation. The distinction between linear GPIO ranges
275 * and pin list based GPIO ranges is managed correctly by this function.
277 * This function assumes the gpio is part of the specified GPIO range, use
278 * only after making sure this is the case (e.g. by calling it on the
279 * result of successful pinctrl_get_device_gpio_range calls)!
281 static inline int gpio_to_pin(struct pinctrl_gpio_range *range,
282 struct gpio_chip *gc, unsigned int offset)
284 unsigned int pin = gc->base + offset - range->base;
286 return range->pins[pin];
288 return range->pin_base + pin;
292 * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
293 * @pctldev: pin controller device to check
294 * @gc: GPIO chip structure from the GPIO subsystem
295 * @offset: hardware offset of the GPIO relative to the controller
297 * Tries to match a GPIO pin number to the ranges handled by a certain pin
298 * controller, return the range or NULL
300 static struct pinctrl_gpio_range *
301 pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, struct gpio_chip *gc,
304 struct pinctrl_gpio_range *range;
306 mutex_lock(&pctldev->mutex);
307 /* Loop over the ranges */
308 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
309 /* Check if we're in the valid range */
310 if ((gc->base + offset) >= range->base &&
311 (gc->base + offset) < range->base + range->npins) {
312 mutex_unlock(&pctldev->mutex);
316 mutex_unlock(&pctldev->mutex);
321 * pinctrl_ready_for_gpio_range() - check if other GPIO pins of
322 * the same GPIO chip are in range
323 * @gc: GPIO chip structure from the GPIO subsystem
324 * @offset: hardware offset of the GPIO relative to the controller
326 * This function is complement of pinctrl_match_gpio_range(). If the return
327 * value of pinctrl_match_gpio_range() is NULL, this function could be used
328 * to check whether pinctrl device is ready or not. Maybe some GPIO pins
329 * of the same GPIO chip don't have back-end pinctrl interface.
330 * If the return value is true, it means that pinctrl device is ready & the
331 * certain GPIO pin doesn't have back-end pinctrl device. If the return value
332 * is false, it means that pinctrl device may not be ready.
334 #ifdef CONFIG_GPIOLIB
335 static bool pinctrl_ready_for_gpio_range(struct gpio_chip *gc,
338 struct pinctrl_dev *pctldev;
339 struct pinctrl_gpio_range *range = NULL;
341 mutex_lock(&pinctrldev_list_mutex);
343 /* Loop over the pin controllers */
344 list_for_each_entry(pctldev, &pinctrldev_list, node) {
345 /* Loop over the ranges */
346 mutex_lock(&pctldev->mutex);
347 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
348 /* Check if any gpio range overlapped with gpio chip */
349 if (range->base + range->npins - 1 < gc->base ||
350 range->base > gc->base + gc->ngpio - 1)
352 mutex_unlock(&pctldev->mutex);
353 mutex_unlock(&pinctrldev_list_mutex);
356 mutex_unlock(&pctldev->mutex);
359 mutex_unlock(&pinctrldev_list_mutex);
365 pinctrl_ready_for_gpio_range(struct gpio_chip *gc, unsigned int offset)
372 * pinctrl_get_device_gpio_range() - find device for GPIO range
373 * @gc: GPIO chip structure from the GPIO subsystem
374 * @offset: hardware offset of the GPIO relative to the controller
375 * @outdev: the pin control device if found
376 * @outrange: the GPIO range if found
378 * Find the pin controller handling a certain GPIO pin from the pinspace of
379 * the GPIO subsystem, return the device and the matching GPIO range. Returns
380 * -EPROBE_DEFER if the GPIO range could not be found in any device since it
381 * may still have not been registered.
383 static int pinctrl_get_device_gpio_range(struct gpio_chip *gc,
385 struct pinctrl_dev **outdev,
386 struct pinctrl_gpio_range **outrange)
388 struct pinctrl_dev *pctldev;
390 mutex_lock(&pinctrldev_list_mutex);
392 /* Loop over the pin controllers */
393 list_for_each_entry(pctldev, &pinctrldev_list, node) {
394 struct pinctrl_gpio_range *range;
396 range = pinctrl_match_gpio_range(pctldev, gc, offset);
400 mutex_unlock(&pinctrldev_list_mutex);
405 mutex_unlock(&pinctrldev_list_mutex);
407 return -EPROBE_DEFER;
411 * pinctrl_add_gpio_range() - register a GPIO range for a controller
412 * @pctldev: pin controller device to add the range to
413 * @range: the GPIO range to add
415 * This adds a range of GPIOs to be handled by a certain pin controller. Call
416 * this to register handled ranges after registering your pin controller.
418 void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
419 struct pinctrl_gpio_range *range)
421 mutex_lock(&pctldev->mutex);
422 list_add_tail(&range->node, &pctldev->gpio_ranges);
423 mutex_unlock(&pctldev->mutex);
425 EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
427 void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
428 struct pinctrl_gpio_range *ranges,
429 unsigned int nranges)
433 for (i = 0; i < nranges; i++)
434 pinctrl_add_gpio_range(pctldev, &ranges[i]);
436 EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges);
438 struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
439 struct pinctrl_gpio_range *range)
441 struct pinctrl_dev *pctldev;
443 pctldev = get_pinctrl_dev_from_devname(devname);
446 * If we can't find this device, let's assume that is because
447 * it has not probed yet, so the driver trying to register this
448 * range need to defer probing.
451 return ERR_PTR(-EPROBE_DEFER);
453 pinctrl_add_gpio_range(pctldev, range);
457 EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range);
459 int pinctrl_get_group_pins(struct pinctrl_dev *pctldev, const char *pin_group,
460 const unsigned int **pins, unsigned int *num_pins)
462 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
465 if (!pctlops->get_group_pins)
468 gs = pinctrl_get_group_selector(pctldev, pin_group);
472 return pctlops->get_group_pins(pctldev, gs, pins, num_pins);
474 EXPORT_SYMBOL_GPL(pinctrl_get_group_pins);
476 struct pinctrl_gpio_range *
477 pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev,
480 struct pinctrl_gpio_range *range;
482 /* Loop over the ranges */
483 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
484 /* Check if we're in the valid range */
487 for (a = 0; a < range->npins; a++) {
488 if (range->pins[a] == pin)
491 } else if (pin >= range->pin_base &&
492 pin < range->pin_base + range->npins)
498 EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin_nolock);
501 * pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin
502 * @pctldev: the pin controller device to look in
503 * @pin: a controller-local number to find the range for
505 struct pinctrl_gpio_range *
506 pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
509 struct pinctrl_gpio_range *range;
511 mutex_lock(&pctldev->mutex);
512 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin);
513 mutex_unlock(&pctldev->mutex);
517 EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin);
520 * pinctrl_remove_gpio_range() - remove a range of GPIOs from a pin controller
521 * @pctldev: pin controller device to remove the range from
522 * @range: the GPIO range to remove
524 void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
525 struct pinctrl_gpio_range *range)
527 mutex_lock(&pctldev->mutex);
528 list_del(&range->node);
529 mutex_unlock(&pctldev->mutex);
531 EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range);
533 #ifdef CONFIG_GENERIC_PINCTRL_GROUPS
536 * pinctrl_generic_get_group_count() - returns the number of pin groups
537 * @pctldev: pin controller device
539 int pinctrl_generic_get_group_count(struct pinctrl_dev *pctldev)
541 return pctldev->num_groups;
543 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_count);
546 * pinctrl_generic_get_group_name() - returns the name of a pin group
547 * @pctldev: pin controller device
548 * @selector: group number
550 const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev,
551 unsigned int selector)
553 struct group_desc *group;
555 group = radix_tree_lookup(&pctldev->pin_group_tree,
560 return group->grp.name;
562 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_name);
565 * pinctrl_generic_get_group_pins() - gets the pin group pins
566 * @pctldev: pin controller device
567 * @selector: group number
568 * @pins: pins in the group
569 * @num_pins: number of pins in the group
571 int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev,
572 unsigned int selector,
573 const unsigned int **pins,
574 unsigned int *num_pins)
576 struct group_desc *group;
578 group = radix_tree_lookup(&pctldev->pin_group_tree,
581 dev_err(pctldev->dev, "%s could not find pingroup%i\n",
586 *pins = group->grp.pins;
587 *num_pins = group->grp.npins;
591 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_pins);
594 * pinctrl_generic_get_group() - returns a pin group based on the number
595 * @pctldev: pin controller device
596 * @selector: group number
598 struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev,
599 unsigned int selector)
601 struct group_desc *group;
603 group = radix_tree_lookup(&pctldev->pin_group_tree,
610 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group);
612 static int pinctrl_generic_group_name_to_selector(struct pinctrl_dev *pctldev,
613 const char *function)
615 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
616 int ngroups = ops->get_groups_count(pctldev);
619 /* See if this pctldev has this group */
620 while (selector < ngroups) {
621 const char *gname = ops->get_group_name(pctldev, selector);
623 if (gname && !strcmp(function, gname))
633 * pinctrl_generic_add_group() - adds a new pin group
634 * @pctldev: pin controller device
635 * @name: name of the pin group
636 * @pins: pins in the pin group
637 * @num_pins: number of pins in the pin group
638 * @data: pin controller driver specific data
640 * Note that the caller must take care of locking.
642 int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name,
643 const unsigned int *pins, int num_pins, void *data)
645 struct group_desc *group;
651 selector = pinctrl_generic_group_name_to_selector(pctldev, name);
655 selector = pctldev->num_groups;
657 group = devm_kzalloc(pctldev->dev, sizeof(*group), GFP_KERNEL);
661 *group = PINCTRL_GROUP_DESC(name, pins, num_pins, data);
663 error = radix_tree_insert(&pctldev->pin_group_tree, selector, group);
667 pctldev->num_groups++;
671 EXPORT_SYMBOL_GPL(pinctrl_generic_add_group);
674 * pinctrl_generic_remove_group() - removes a numbered pin group
675 * @pctldev: pin controller device
676 * @selector: group number
678 * Note that the caller must take care of locking.
680 int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev,
681 unsigned int selector)
683 struct group_desc *group;
685 group = radix_tree_lookup(&pctldev->pin_group_tree,
690 radix_tree_delete(&pctldev->pin_group_tree, selector);
691 devm_kfree(pctldev->dev, group);
693 pctldev->num_groups--;
697 EXPORT_SYMBOL_GPL(pinctrl_generic_remove_group);
700 * pinctrl_generic_free_groups() - removes all pin groups
701 * @pctldev: pin controller device
703 * Note that the caller must take care of locking. The pinctrl groups
704 * are allocated with devm_kzalloc() so no need to free them here.
706 static void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev)
708 struct radix_tree_iter iter;
711 radix_tree_for_each_slot(slot, &pctldev->pin_group_tree, &iter, 0)
712 radix_tree_delete(&pctldev->pin_group_tree, iter.index);
714 pctldev->num_groups = 0;
718 static inline void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev)
721 #endif /* CONFIG_GENERIC_PINCTRL_GROUPS */
724 * pinctrl_get_group_selector() - returns the group selector for a group
725 * @pctldev: the pin controller handling the group
726 * @pin_group: the pin group to look up
728 int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
729 const char *pin_group)
731 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
732 unsigned int ngroups = pctlops->get_groups_count(pctldev);
733 unsigned int group_selector = 0;
735 while (group_selector < ngroups) {
736 const char *gname = pctlops->get_group_name(pctldev,
738 if (gname && !strcmp(gname, pin_group)) {
739 dev_dbg(pctldev->dev,
740 "found group selector %u for %s\n",
743 return group_selector;
749 dev_err(pctldev->dev, "does not have pin group %s\n",
755 bool pinctrl_gpio_can_use_line(struct gpio_chip *gc, unsigned int offset)
757 struct pinctrl_dev *pctldev;
758 struct pinctrl_gpio_range *range;
763 * Try to obtain GPIO range, if it fails
764 * we're probably dealing with GPIO driver
765 * without a backing pin controller - bail out.
767 if (pinctrl_get_device_gpio_range(gc, offset, &pctldev, &range))
770 mutex_lock(&pctldev->mutex);
772 /* Convert to the pin controllers number space */
773 pin = gpio_to_pin(range, gc, offset);
775 result = pinmux_can_be_used_for_gpio(pctldev, pin);
777 mutex_unlock(&pctldev->mutex);
781 EXPORT_SYMBOL_GPL(pinctrl_gpio_can_use_line);
784 * pinctrl_gpio_request() - request a single pin to be used as GPIO
785 * @gc: GPIO chip structure from the GPIO subsystem
786 * @offset: hardware offset of the GPIO relative to the controller
788 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
789 * as part of their gpio_request() semantics, platforms and individual drivers
790 * shall *NOT* request GPIO pins to be muxed in.
792 int pinctrl_gpio_request(struct gpio_chip *gc, unsigned int offset)
794 struct pinctrl_gpio_range *range;
795 struct pinctrl_dev *pctldev;
798 ret = pinctrl_get_device_gpio_range(gc, offset, &pctldev, &range);
800 if (pinctrl_ready_for_gpio_range(gc, offset))
805 mutex_lock(&pctldev->mutex);
807 /* Convert to the pin controllers number space */
808 pin = gpio_to_pin(range, gc, offset);
810 ret = pinmux_request_gpio(pctldev, range, pin, gc->base + offset);
812 mutex_unlock(&pctldev->mutex);
816 EXPORT_SYMBOL_GPL(pinctrl_gpio_request);
819 * pinctrl_gpio_free() - free control on a single pin, currently used as GPIO
820 * @gc: GPIO chip structure from the GPIO subsystem
821 * @offset: hardware offset of the GPIO relative to the controller
823 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
824 * as part of their gpio_request() semantics, platforms and individual drivers
825 * shall *NOT* request GPIO pins to be muxed in.
827 void pinctrl_gpio_free(struct gpio_chip *gc, unsigned int offset)
829 struct pinctrl_gpio_range *range;
830 struct pinctrl_dev *pctldev;
833 ret = pinctrl_get_device_gpio_range(gc, offset, &pctldev, &range);
837 mutex_lock(&pctldev->mutex);
839 /* Convert to the pin controllers number space */
840 pin = gpio_to_pin(range, gc, offset);
842 pinmux_free_gpio(pctldev, pin, range);
844 mutex_unlock(&pctldev->mutex);
846 EXPORT_SYMBOL_GPL(pinctrl_gpio_free);
848 static int pinctrl_gpio_direction(struct gpio_chip *gc, unsigned int offset,
851 struct pinctrl_dev *pctldev;
852 struct pinctrl_gpio_range *range;
856 ret = pinctrl_get_device_gpio_range(gc, offset, &pctldev, &range);
861 mutex_lock(&pctldev->mutex);
863 /* Convert to the pin controllers number space */
864 pin = gpio_to_pin(range, gc, offset);
865 ret = pinmux_gpio_direction(pctldev, range, pin, input);
867 mutex_unlock(&pctldev->mutex);
873 * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode
874 * @gc: GPIO chip structure from the GPIO subsystem
875 * @offset: hardware offset of the GPIO relative to the controller
877 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
878 * as part of their gpio_direction_input() semantics, platforms and individual
879 * drivers shall *NOT* touch pin control GPIO calls.
881 int pinctrl_gpio_direction_input(struct gpio_chip *gc, unsigned int offset)
883 return pinctrl_gpio_direction(gc, offset, true);
885 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
888 * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode
889 * @gc: GPIO chip structure from the GPIO subsystem
890 * @offset: hardware offset of the GPIO relative to the controller
892 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
893 * as part of their gpio_direction_output() semantics, platforms and individual
894 * drivers shall *NOT* touch pin control GPIO calls.
896 int pinctrl_gpio_direction_output(struct gpio_chip *gc, unsigned int offset)
898 return pinctrl_gpio_direction(gc, offset, false);
900 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
903 * pinctrl_gpio_set_config() - Apply config to given GPIO pin
904 * @gc: GPIO chip structure from the GPIO subsystem
905 * @offset: hardware offset of the GPIO relative to the controller
906 * @config: the configuration to apply to the GPIO
908 * This function should *ONLY* be used from gpiolib-based GPIO drivers, if
909 * they need to call the underlying pin controller to change GPIO config
910 * (for example set debounce time).
912 int pinctrl_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
913 unsigned long config)
915 unsigned long configs[] = { config };
916 struct pinctrl_gpio_range *range;
917 struct pinctrl_dev *pctldev;
920 ret = pinctrl_get_device_gpio_range(gc, offset, &pctldev, &range);
924 mutex_lock(&pctldev->mutex);
925 pin = gpio_to_pin(range, gc, offset);
926 ret = pinconf_set_config(pctldev, pin, configs, ARRAY_SIZE(configs));
927 mutex_unlock(&pctldev->mutex);
931 EXPORT_SYMBOL_GPL(pinctrl_gpio_set_config);
933 static struct pinctrl_state *find_state(struct pinctrl *p,
936 struct pinctrl_state *state;
938 list_for_each_entry(state, &p->states, node)
939 if (!strcmp(state->name, name))
945 static struct pinctrl_state *create_state(struct pinctrl *p,
948 struct pinctrl_state *state;
950 state = kzalloc(sizeof(*state), GFP_KERNEL);
952 return ERR_PTR(-ENOMEM);
955 INIT_LIST_HEAD(&state->settings);
957 list_add_tail(&state->node, &p->states);
962 static int add_setting(struct pinctrl *p, struct pinctrl_dev *pctldev,
963 const struct pinctrl_map *map)
965 struct pinctrl_state *state;
966 struct pinctrl_setting *setting;
969 state = find_state(p, map->name);
971 state = create_state(p, map->name);
973 return PTR_ERR(state);
975 if (map->type == PIN_MAP_TYPE_DUMMY_STATE)
978 setting = kzalloc(sizeof(*setting), GFP_KERNEL);
982 setting->type = map->type;
985 setting->pctldev = pctldev;
988 get_pinctrl_dev_from_devname(map->ctrl_dev_name);
989 if (!setting->pctldev) {
991 /* Do not defer probing of hogs (circular loop) */
992 if (!strcmp(map->ctrl_dev_name, map->dev_name))
995 * OK let us guess that the driver is not there yet, and
996 * let's defer obtaining this pinctrl handle to later...
998 dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe",
1000 return -EPROBE_DEFER;
1003 setting->dev_name = map->dev_name;
1005 switch (map->type) {
1006 case PIN_MAP_TYPE_MUX_GROUP:
1007 ret = pinmux_map_to_setting(map, setting);
1009 case PIN_MAP_TYPE_CONFIGS_PIN:
1010 case PIN_MAP_TYPE_CONFIGS_GROUP:
1011 ret = pinconf_map_to_setting(map, setting);
1022 list_add_tail(&setting->node, &state->settings);
1027 static struct pinctrl *find_pinctrl(struct device *dev)
1031 mutex_lock(&pinctrl_list_mutex);
1032 list_for_each_entry(p, &pinctrl_list, node)
1033 if (p->dev == dev) {
1034 mutex_unlock(&pinctrl_list_mutex);
1038 mutex_unlock(&pinctrl_list_mutex);
1042 static void pinctrl_free(struct pinctrl *p, bool inlist);
1044 static struct pinctrl *create_pinctrl(struct device *dev,
1045 struct pinctrl_dev *pctldev)
1048 const char *devname;
1049 struct pinctrl_maps *maps_node;
1050 const struct pinctrl_map *map;
1054 * create the state cookie holder struct pinctrl for each
1055 * mapping, this is what consumers will get when requesting
1056 * a pin control handle with pinctrl_get()
1058 p = kzalloc(sizeof(*p), GFP_KERNEL);
1060 return ERR_PTR(-ENOMEM);
1062 INIT_LIST_HEAD(&p->states);
1063 INIT_LIST_HEAD(&p->dt_maps);
1065 ret = pinctrl_dt_to_map(p, pctldev);
1068 return ERR_PTR(ret);
1071 devname = dev_name(dev);
1073 mutex_lock(&pinctrl_maps_mutex);
1074 /* Iterate over the pin control maps to locate the right ones */
1075 for_each_pin_map(maps_node, map) {
1076 /* Map must be for this device */
1077 if (strcmp(map->dev_name, devname))
1080 * If pctldev is not null, we are claiming hog for it,
1081 * that means, setting that is served by pctldev by itself.
1083 * Thus we must skip map that is for this device but is served
1087 strcmp(dev_name(pctldev->dev), map->ctrl_dev_name))
1090 ret = add_setting(p, pctldev, map);
1092 * At this point the adding of a setting may:
1094 * - Defer, if the pinctrl device is not yet available
1095 * - Fail, if the pinctrl device is not yet available,
1096 * AND the setting is a hog. We cannot defer that, since
1097 * the hog will kick in immediately after the device
1100 * If the error returned was not -EPROBE_DEFER then we
1101 * accumulate the errors to see if we end up with
1102 * an -EPROBE_DEFER later, as that is the worst case.
1104 if (ret == -EPROBE_DEFER) {
1105 pinctrl_free(p, false);
1106 mutex_unlock(&pinctrl_maps_mutex);
1107 return ERR_PTR(ret);
1110 mutex_unlock(&pinctrl_maps_mutex);
1113 /* If some other error than deferral occurred, return here */
1114 pinctrl_free(p, false);
1115 return ERR_PTR(ret);
1118 kref_init(&p->users);
1120 /* Add the pinctrl handle to the global list */
1121 mutex_lock(&pinctrl_list_mutex);
1122 list_add_tail(&p->node, &pinctrl_list);
1123 mutex_unlock(&pinctrl_list_mutex);
1129 * pinctrl_get() - retrieves the pinctrl handle for a device
1130 * @dev: the device to obtain the handle for
1132 struct pinctrl *pinctrl_get(struct device *dev)
1137 return ERR_PTR(-EINVAL);
1140 * See if somebody else (such as the device core) has already
1141 * obtained a handle to the pinctrl for this device. In that case,
1142 * return another pointer to it.
1144 p = find_pinctrl(dev);
1146 dev_dbg(dev, "obtain a copy of previously claimed pinctrl\n");
1147 kref_get(&p->users);
1151 return create_pinctrl(dev, NULL);
1153 EXPORT_SYMBOL_GPL(pinctrl_get);
1155 static void pinctrl_free_setting(bool disable_setting,
1156 struct pinctrl_setting *setting)
1158 switch (setting->type) {
1159 case PIN_MAP_TYPE_MUX_GROUP:
1160 if (disable_setting)
1161 pinmux_disable_setting(setting);
1162 pinmux_free_setting(setting);
1164 case PIN_MAP_TYPE_CONFIGS_PIN:
1165 case PIN_MAP_TYPE_CONFIGS_GROUP:
1166 pinconf_free_setting(setting);
1173 static void pinctrl_free(struct pinctrl *p, bool inlist)
1175 struct pinctrl_state *state, *n1;
1176 struct pinctrl_setting *setting, *n2;
1178 mutex_lock(&pinctrl_list_mutex);
1179 list_for_each_entry_safe(state, n1, &p->states, node) {
1180 list_for_each_entry_safe(setting, n2, &state->settings, node) {
1181 pinctrl_free_setting(state == p->state, setting);
1182 list_del(&setting->node);
1185 list_del(&state->node);
1189 pinctrl_dt_free_maps(p);
1194 mutex_unlock(&pinctrl_list_mutex);
1198 * pinctrl_release() - release the pinctrl handle
1199 * @kref: the kref in the pinctrl being released
1201 static void pinctrl_release(struct kref *kref)
1203 struct pinctrl *p = container_of(kref, struct pinctrl, users);
1205 pinctrl_free(p, true);
1209 * pinctrl_put() - decrease use count on a previously claimed pinctrl handle
1210 * @p: the pinctrl handle to release
1212 void pinctrl_put(struct pinctrl *p)
1214 kref_put(&p->users, pinctrl_release);
1216 EXPORT_SYMBOL_GPL(pinctrl_put);
1219 * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle
1220 * @p: the pinctrl handle to retrieve the state from
1221 * @name: the state name to retrieve
1223 struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p,
1226 struct pinctrl_state *state;
1228 state = find_state(p, name);
1230 if (pinctrl_dummy_state) {
1231 /* create dummy state */
1232 dev_dbg(p->dev, "using pinctrl dummy state (%s)\n",
1234 state = create_state(p, name);
1236 state = ERR_PTR(-ENODEV);
1241 EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
1243 static void pinctrl_link_add(struct pinctrl_dev *pctldev,
1244 struct device *consumer)
1246 if (pctldev->desc->link_consumers)
1247 device_link_add(consumer, pctldev->dev,
1248 DL_FLAG_PM_RUNTIME |
1249 DL_FLAG_AUTOREMOVE_CONSUMER);
1253 * pinctrl_commit_state() - select/activate/program a pinctrl state to HW
1254 * @p: the pinctrl handle for the device that requests configuration
1255 * @state: the state handle to select/activate/program
1257 static int pinctrl_commit_state(struct pinctrl *p, struct pinctrl_state *state)
1259 struct pinctrl_setting *setting, *setting2;
1260 struct pinctrl_state *old_state = READ_ONCE(p->state);
1265 * For each pinmux setting in the old state, forget SW's record
1266 * of mux owner for that pingroup. Any pingroups which are
1267 * still owned by the new state will be re-acquired by the call
1268 * to pinmux_enable_setting() in the loop below.
1270 list_for_each_entry(setting, &old_state->settings, node) {
1271 if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
1273 pinmux_disable_setting(setting);
1279 /* Apply all the settings for the new state - pinmux first */
1280 list_for_each_entry(setting, &state->settings, node) {
1281 switch (setting->type) {
1282 case PIN_MAP_TYPE_MUX_GROUP:
1283 ret = pinmux_enable_setting(setting);
1285 case PIN_MAP_TYPE_CONFIGS_PIN:
1286 case PIN_MAP_TYPE_CONFIGS_GROUP:
1295 goto unapply_new_state;
1297 /* Do not link hogs (circular dependency) */
1298 if (p != setting->pctldev->p)
1299 pinctrl_link_add(setting->pctldev, p->dev);
1302 /* Apply all the settings for the new state - pinconf after */
1303 list_for_each_entry(setting, &state->settings, node) {
1304 switch (setting->type) {
1305 case PIN_MAP_TYPE_MUX_GROUP:
1308 case PIN_MAP_TYPE_CONFIGS_PIN:
1309 case PIN_MAP_TYPE_CONFIGS_GROUP:
1310 ret = pinconf_apply_setting(setting);
1318 goto unapply_new_state;
1321 /* Do not link hogs (circular dependency) */
1322 if (p != setting->pctldev->p)
1323 pinctrl_link_add(setting->pctldev, p->dev);
1331 dev_err(p->dev, "Error applying setting, reverse things back\n");
1333 list_for_each_entry(setting2, &state->settings, node) {
1334 if (&setting2->node == &setting->node)
1337 * All we can do here is pinmux_disable_setting.
1338 * That means that some pins are muxed differently now
1339 * than they were before applying the setting (We can't
1340 * "unmux a pin"!), but it's not a big deal since the pins
1341 * are free to be muxed by another apply_setting.
1343 if (setting2->type == PIN_MAP_TYPE_MUX_GROUP)
1344 pinmux_disable_setting(setting2);
1347 /* There's no infinite recursive loop here because p->state is NULL */
1349 pinctrl_select_state(p, old_state);
1355 * pinctrl_select_state() - select/activate/program a pinctrl state to HW
1356 * @p: the pinctrl handle for the device that requests configuration
1357 * @state: the state handle to select/activate/program
1359 int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
1361 if (p->state == state)
1364 return pinctrl_commit_state(p, state);
1366 EXPORT_SYMBOL_GPL(pinctrl_select_state);
1368 static void devm_pinctrl_release(struct device *dev, void *res)
1370 pinctrl_put(*(struct pinctrl **)res);
1374 * devm_pinctrl_get() - Resource managed pinctrl_get()
1375 * @dev: the device to obtain the handle for
1377 * If there is a need to explicitly destroy the returned struct pinctrl,
1378 * devm_pinctrl_put() should be used, rather than plain pinctrl_put().
1380 struct pinctrl *devm_pinctrl_get(struct device *dev)
1382 struct pinctrl **ptr, *p;
1384 ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL);
1386 return ERR_PTR(-ENOMEM);
1388 p = pinctrl_get(dev);
1391 devres_add(dev, ptr);
1398 EXPORT_SYMBOL_GPL(devm_pinctrl_get);
1400 static int devm_pinctrl_match(struct device *dev, void *res, void *data)
1402 struct pinctrl **p = res;
1408 * devm_pinctrl_put() - Resource managed pinctrl_put()
1409 * @p: the pinctrl handle to release
1411 * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally
1412 * this function will not need to be called and the resource management
1413 * code will ensure that the resource is freed.
1415 void devm_pinctrl_put(struct pinctrl *p)
1417 WARN_ON(devres_release(p->dev, devm_pinctrl_release,
1418 devm_pinctrl_match, p));
1420 EXPORT_SYMBOL_GPL(devm_pinctrl_put);
1423 * pinctrl_register_mappings() - register a set of pin controller mappings
1424 * @maps: the pincontrol mappings table to register. Note the pinctrl-core
1425 * keeps a reference to the passed in maps, so they should _not_ be
1426 * marked with __initdata.
1427 * @num_maps: the number of maps in the mapping table
1429 int pinctrl_register_mappings(const struct pinctrl_map *maps,
1430 unsigned int num_maps)
1433 struct pinctrl_maps *maps_node;
1435 pr_debug("add %u pinctrl maps\n", num_maps);
1437 /* First sanity check the new mapping */
1438 for (i = 0; i < num_maps; i++) {
1439 if (!maps[i].dev_name) {
1440 pr_err("failed to register map %s (%d): no device given\n",
1445 if (!maps[i].name) {
1446 pr_err("failed to register map %d: no map name given\n",
1451 if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE &&
1452 !maps[i].ctrl_dev_name) {
1453 pr_err("failed to register map %s (%d): no pin control device given\n",
1458 switch (maps[i].type) {
1459 case PIN_MAP_TYPE_DUMMY_STATE:
1461 case PIN_MAP_TYPE_MUX_GROUP:
1462 ret = pinmux_validate_map(&maps[i], i);
1466 case PIN_MAP_TYPE_CONFIGS_PIN:
1467 case PIN_MAP_TYPE_CONFIGS_GROUP:
1468 ret = pinconf_validate_map(&maps[i], i);
1473 pr_err("failed to register map %s (%d): invalid type given\n",
1479 maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL);
1483 maps_node->maps = maps;
1484 maps_node->num_maps = num_maps;
1486 mutex_lock(&pinctrl_maps_mutex);
1487 list_add_tail(&maps_node->node, &pinctrl_maps);
1488 mutex_unlock(&pinctrl_maps_mutex);
1492 EXPORT_SYMBOL_GPL(pinctrl_register_mappings);
1495 * pinctrl_unregister_mappings() - unregister a set of pin controller mappings
1496 * @map: the pincontrol mappings table passed to pinctrl_register_mappings()
1497 * when registering the mappings.
1499 void pinctrl_unregister_mappings(const struct pinctrl_map *map)
1501 struct pinctrl_maps *maps_node;
1503 mutex_lock(&pinctrl_maps_mutex);
1504 list_for_each_entry(maps_node, &pinctrl_maps, node) {
1505 if (maps_node->maps == map) {
1506 list_del(&maps_node->node);
1508 mutex_unlock(&pinctrl_maps_mutex);
1512 mutex_unlock(&pinctrl_maps_mutex);
1514 EXPORT_SYMBOL_GPL(pinctrl_unregister_mappings);
1517 * pinctrl_force_sleep() - turn a given controller device into sleep state
1518 * @pctldev: pin controller device
1520 int pinctrl_force_sleep(struct pinctrl_dev *pctldev)
1522 if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_sleep))
1523 return pinctrl_commit_state(pctldev->p, pctldev->hog_sleep);
1526 EXPORT_SYMBOL_GPL(pinctrl_force_sleep);
1529 * pinctrl_force_default() - turn a given controller device into default state
1530 * @pctldev: pin controller device
1532 int pinctrl_force_default(struct pinctrl_dev *pctldev)
1534 if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_default))
1535 return pinctrl_commit_state(pctldev->p, pctldev->hog_default);
1538 EXPORT_SYMBOL_GPL(pinctrl_force_default);
1541 * pinctrl_init_done() - tell pinctrl probe is done
1543 * We'll use this time to switch the pins from "init" to "default" unless the
1544 * driver selected some other state.
1546 * @dev: device to that's done probing
1548 int pinctrl_init_done(struct device *dev)
1550 struct dev_pin_info *pins = dev->pins;
1556 if (IS_ERR(pins->init_state))
1557 return 0; /* No such state */
1559 if (pins->p->state != pins->init_state)
1560 return 0; /* Not at init anyway */
1562 if (IS_ERR(pins->default_state))
1563 return 0; /* No default state */
1565 ret = pinctrl_select_state(pins->p, pins->default_state);
1567 dev_err(dev, "failed to activate default pinctrl state\n");
1572 static int pinctrl_select_bound_state(struct device *dev,
1573 struct pinctrl_state *state)
1575 struct dev_pin_info *pins = dev->pins;
1579 return 0; /* No such state */
1580 ret = pinctrl_select_state(pins->p, state);
1582 dev_err(dev, "failed to activate pinctrl state %s\n",
1588 * pinctrl_select_default_state() - select default pinctrl state
1589 * @dev: device to select default state for
1591 int pinctrl_select_default_state(struct device *dev)
1596 return pinctrl_select_bound_state(dev, dev->pins->default_state);
1598 EXPORT_SYMBOL_GPL(pinctrl_select_default_state);
1603 * pinctrl_pm_select_default_state() - select default pinctrl state for PM
1604 * @dev: device to select default state for
1606 int pinctrl_pm_select_default_state(struct device *dev)
1608 return pinctrl_select_default_state(dev);
1610 EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state);
1613 * pinctrl_pm_select_sleep_state() - select sleep pinctrl state for PM
1614 * @dev: device to select sleep state for
1616 int pinctrl_pm_select_sleep_state(struct device *dev)
1621 return pinctrl_select_bound_state(dev, dev->pins->sleep_state);
1623 EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state);
1626 * pinctrl_pm_select_idle_state() - select idle pinctrl state for PM
1627 * @dev: device to select idle state for
1629 int pinctrl_pm_select_idle_state(struct device *dev)
1634 return pinctrl_select_bound_state(dev, dev->pins->idle_state);
1636 EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state);
1639 #ifdef CONFIG_DEBUG_FS
1641 static int pinctrl_pins_show(struct seq_file *s, void *what)
1643 struct pinctrl_dev *pctldev = s->private;
1644 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1645 unsigned int i, pin;
1646 #ifdef CONFIG_GPIOLIB
1647 struct gpio_device *gdev __free(gpio_device_put) = NULL;
1648 struct pinctrl_gpio_range *range;
1652 seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
1654 mutex_lock(&pctldev->mutex);
1656 /* The pin number can be retrived from the pin controller descriptor */
1657 for (i = 0; i < pctldev->desc->npins; i++) {
1658 struct pin_desc *desc;
1660 pin = pctldev->desc->pins[i].number;
1661 desc = pin_desc_get(pctldev, pin);
1662 /* Pin space may be sparse */
1666 seq_printf(s, "pin %d (%s) ", pin, desc->name);
1668 #ifdef CONFIG_GPIOLIB
1670 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
1671 if ((pin >= range->pin_base) &&
1672 (pin < (range->pin_base + range->npins))) {
1673 gpio_num = range->base + (pin - range->pin_base);
1679 * FIXME: gpio_num comes from the global GPIO numberspace.
1680 * we need to get rid of the range->base eventually and
1681 * get the descriptor directly from the gpio_chip.
1683 gdev = gpiod_to_gpio_device(gpio_to_desc(gpio_num));
1685 seq_printf(s, "%u:%s ",
1686 gpio_num - gpio_device_get_base(gdev),
1687 gpio_device_get_label(gdev));
1689 seq_puts(s, "0:? ");
1692 /* Driver-specific info per pin */
1693 if (ops->pin_dbg_show)
1694 ops->pin_dbg_show(pctldev, s, pin);
1699 mutex_unlock(&pctldev->mutex);
1703 DEFINE_SHOW_ATTRIBUTE(pinctrl_pins);
1705 static int pinctrl_groups_show(struct seq_file *s, void *what)
1707 struct pinctrl_dev *pctldev = s->private;
1708 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1709 unsigned int ngroups, selector = 0;
1711 mutex_lock(&pctldev->mutex);
1713 ngroups = ops->get_groups_count(pctldev);
1715 seq_puts(s, "registered pin groups:\n");
1716 while (selector < ngroups) {
1717 const unsigned int *pins = NULL;
1718 unsigned int num_pins = 0;
1719 const char *gname = ops->get_group_name(pctldev, selector);
1724 if (ops->get_group_pins)
1725 ret = ops->get_group_pins(pctldev, selector,
1728 seq_printf(s, "%s [ERROR GETTING PINS]\n",
1731 seq_printf(s, "group: %s\n", gname);
1732 for (i = 0; i < num_pins; i++) {
1733 pname = pin_get_name(pctldev, pins[i]);
1734 if (WARN_ON(!pname)) {
1735 mutex_unlock(&pctldev->mutex);
1738 seq_printf(s, "pin %d (%s)\n", pins[i], pname);
1745 mutex_unlock(&pctldev->mutex);
1749 DEFINE_SHOW_ATTRIBUTE(pinctrl_groups);
1751 static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
1753 struct pinctrl_dev *pctldev = s->private;
1754 struct pinctrl_gpio_range *range;
1756 seq_puts(s, "GPIO ranges handled:\n");
1758 mutex_lock(&pctldev->mutex);
1760 /* Loop over the ranges */
1761 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
1764 seq_printf(s, "%u: %s GPIOS [%u - %u] PINS {",
1765 range->id, range->name,
1766 range->base, (range->base + range->npins - 1));
1767 for (a = 0; a < range->npins - 1; a++)
1768 seq_printf(s, "%u, ", range->pins[a]);
1769 seq_printf(s, "%u}\n", range->pins[a]);
1772 seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
1773 range->id, range->name,
1774 range->base, (range->base + range->npins - 1),
1776 (range->pin_base + range->npins - 1));
1779 mutex_unlock(&pctldev->mutex);
1783 DEFINE_SHOW_ATTRIBUTE(pinctrl_gpioranges);
1785 static int pinctrl_devices_show(struct seq_file *s, void *what)
1787 struct pinctrl_dev *pctldev;
1789 seq_puts(s, "name [pinmux] [pinconf]\n");
1791 mutex_lock(&pinctrldev_list_mutex);
1793 list_for_each_entry(pctldev, &pinctrldev_list, node) {
1794 seq_printf(s, "%s ", pctldev->desc->name);
1795 if (pctldev->desc->pmxops)
1796 seq_puts(s, "yes ");
1799 if (pctldev->desc->confops)
1806 mutex_unlock(&pinctrldev_list_mutex);
1810 DEFINE_SHOW_ATTRIBUTE(pinctrl_devices);
1812 static inline const char *map_type(enum pinctrl_map_type type)
1814 static const char * const names[] = {
1822 if (type >= ARRAY_SIZE(names))
1828 static int pinctrl_maps_show(struct seq_file *s, void *what)
1830 struct pinctrl_maps *maps_node;
1831 const struct pinctrl_map *map;
1833 seq_puts(s, "Pinctrl maps:\n");
1835 mutex_lock(&pinctrl_maps_mutex);
1836 for_each_pin_map(maps_node, map) {
1837 seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n",
1838 map->dev_name, map->name, map_type(map->type),
1841 if (map->type != PIN_MAP_TYPE_DUMMY_STATE)
1842 seq_printf(s, "controlling device %s\n",
1843 map->ctrl_dev_name);
1845 switch (map->type) {
1846 case PIN_MAP_TYPE_MUX_GROUP:
1847 pinmux_show_map(s, map);
1849 case PIN_MAP_TYPE_CONFIGS_PIN:
1850 case PIN_MAP_TYPE_CONFIGS_GROUP:
1851 pinconf_show_map(s, map);
1859 mutex_unlock(&pinctrl_maps_mutex);
1863 DEFINE_SHOW_ATTRIBUTE(pinctrl_maps);
1865 static int pinctrl_show(struct seq_file *s, void *what)
1868 struct pinctrl_state *state;
1869 struct pinctrl_setting *setting;
1871 seq_puts(s, "Requested pin control handlers their pinmux maps:\n");
1873 mutex_lock(&pinctrl_list_mutex);
1875 list_for_each_entry(p, &pinctrl_list, node) {
1876 seq_printf(s, "device: %s current state: %s\n",
1878 p->state ? p->state->name : "none");
1880 list_for_each_entry(state, &p->states, node) {
1881 seq_printf(s, " state: %s\n", state->name);
1883 list_for_each_entry(setting, &state->settings, node) {
1884 struct pinctrl_dev *pctldev = setting->pctldev;
1886 seq_printf(s, " type: %s controller %s ",
1887 map_type(setting->type),
1888 pinctrl_dev_get_name(pctldev));
1890 switch (setting->type) {
1891 case PIN_MAP_TYPE_MUX_GROUP:
1892 pinmux_show_setting(s, setting);
1894 case PIN_MAP_TYPE_CONFIGS_PIN:
1895 case PIN_MAP_TYPE_CONFIGS_GROUP:
1896 pinconf_show_setting(s, setting);
1905 mutex_unlock(&pinctrl_list_mutex);
1909 DEFINE_SHOW_ATTRIBUTE(pinctrl);
1911 static struct dentry *debugfs_root;
1913 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1915 struct dentry *device_root;
1916 const char *debugfs_name;
1918 if (pctldev->desc->name &&
1919 strcmp(dev_name(pctldev->dev), pctldev->desc->name)) {
1920 debugfs_name = devm_kasprintf(pctldev->dev, GFP_KERNEL,
1921 "%s-%s", dev_name(pctldev->dev),
1922 pctldev->desc->name);
1923 if (!debugfs_name) {
1924 pr_warn("failed to determine debugfs dir name for %s\n",
1925 dev_name(pctldev->dev));
1929 debugfs_name = dev_name(pctldev->dev);
1932 device_root = debugfs_create_dir(debugfs_name, debugfs_root);
1933 pctldev->device_root = device_root;
1935 if (IS_ERR(device_root) || !device_root) {
1936 pr_warn("failed to create debugfs directory for %s\n",
1937 dev_name(pctldev->dev));
1940 debugfs_create_file("pins", 0444,
1941 device_root, pctldev, &pinctrl_pins_fops);
1942 debugfs_create_file("pingroups", 0444,
1943 device_root, pctldev, &pinctrl_groups_fops);
1944 debugfs_create_file("gpio-ranges", 0444,
1945 device_root, pctldev, &pinctrl_gpioranges_fops);
1946 if (pctldev->desc->pmxops)
1947 pinmux_init_device_debugfs(device_root, pctldev);
1948 if (pctldev->desc->confops)
1949 pinconf_init_device_debugfs(device_root, pctldev);
1952 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1954 debugfs_remove_recursive(pctldev->device_root);
1957 static void pinctrl_init_debugfs(void)
1959 debugfs_root = debugfs_create_dir("pinctrl", NULL);
1960 if (IS_ERR(debugfs_root) || !debugfs_root) {
1961 pr_warn("failed to create debugfs directory\n");
1962 debugfs_root = NULL;
1966 debugfs_create_file("pinctrl-devices", 0444,
1967 debugfs_root, NULL, &pinctrl_devices_fops);
1968 debugfs_create_file("pinctrl-maps", 0444,
1969 debugfs_root, NULL, &pinctrl_maps_fops);
1970 debugfs_create_file("pinctrl-handles", 0444,
1971 debugfs_root, NULL, &pinctrl_fops);
1974 #else /* CONFIG_DEBUG_FS */
1976 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1980 static void pinctrl_init_debugfs(void)
1984 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1990 static int pinctrl_check_ops(struct pinctrl_dev *pctldev)
1992 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1995 !ops->get_groups_count ||
1996 !ops->get_group_name)
2003 * pinctrl_init_controller() - init a pin controller device
2004 * @pctldesc: descriptor for this pin controller
2005 * @dev: parent device for this pin controller
2006 * @driver_data: private pin controller data for this pin controller
2008 static struct pinctrl_dev *
2009 pinctrl_init_controller(struct pinctrl_desc *pctldesc, struct device *dev,
2012 struct pinctrl_dev *pctldev;
2016 return ERR_PTR(-EINVAL);
2017 if (!pctldesc->name)
2018 return ERR_PTR(-EINVAL);
2020 pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL);
2022 return ERR_PTR(-ENOMEM);
2024 /* Initialize pin control device struct */
2025 pctldev->owner = pctldesc->owner;
2026 pctldev->desc = pctldesc;
2027 pctldev->driver_data = driver_data;
2028 INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
2029 #ifdef CONFIG_GENERIC_PINCTRL_GROUPS
2030 INIT_RADIX_TREE(&pctldev->pin_group_tree, GFP_KERNEL);
2032 #ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS
2033 INIT_RADIX_TREE(&pctldev->pin_function_tree, GFP_KERNEL);
2035 INIT_LIST_HEAD(&pctldev->gpio_ranges);
2036 INIT_LIST_HEAD(&pctldev->node);
2038 mutex_init(&pctldev->mutex);
2040 /* check core ops for sanity */
2041 ret = pinctrl_check_ops(pctldev);
2043 dev_err(dev, "pinctrl ops lacks necessary functions\n");
2047 /* If we're implementing pinmuxing, check the ops for sanity */
2048 if (pctldesc->pmxops) {
2049 ret = pinmux_check_ops(pctldev);
2054 /* If we're implementing pinconfig, check the ops for sanity */
2055 if (pctldesc->confops) {
2056 ret = pinconf_check_ops(pctldev);
2061 /* Register all the pins */
2062 dev_dbg(dev, "try to register %d pins ...\n", pctldesc->npins);
2063 ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins);
2065 dev_err(dev, "error during pin registration\n");
2066 pinctrl_free_pindescs(pctldev, pctldesc->pins,
2074 mutex_destroy(&pctldev->mutex);
2076 return ERR_PTR(ret);
2079 static int pinctrl_claim_hogs(struct pinctrl_dev *pctldev)
2081 pctldev->p = create_pinctrl(pctldev->dev, pctldev);
2082 if (PTR_ERR(pctldev->p) == -ENODEV) {
2083 dev_dbg(pctldev->dev, "no hogs found\n");
2088 if (IS_ERR(pctldev->p)) {
2089 dev_err(pctldev->dev, "error claiming hogs: %li\n",
2090 PTR_ERR(pctldev->p));
2092 return PTR_ERR(pctldev->p);
2095 pctldev->hog_default =
2096 pinctrl_lookup_state(pctldev->p, PINCTRL_STATE_DEFAULT);
2097 if (IS_ERR(pctldev->hog_default)) {
2098 dev_dbg(pctldev->dev,
2099 "failed to lookup the default state\n");
2101 if (pinctrl_select_state(pctldev->p,
2102 pctldev->hog_default))
2103 dev_err(pctldev->dev,
2104 "failed to select default state\n");
2107 pctldev->hog_sleep =
2108 pinctrl_lookup_state(pctldev->p,
2109 PINCTRL_STATE_SLEEP);
2110 if (IS_ERR(pctldev->hog_sleep))
2111 dev_dbg(pctldev->dev,
2112 "failed to lookup the sleep state\n");
2117 int pinctrl_enable(struct pinctrl_dev *pctldev)
2121 error = pinctrl_claim_hogs(pctldev);
2123 dev_err(pctldev->dev, "could not claim hogs: %i\n",
2125 pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
2126 pctldev->desc->npins);
2127 mutex_destroy(&pctldev->mutex);
2133 mutex_lock(&pinctrldev_list_mutex);
2134 list_add_tail(&pctldev->node, &pinctrldev_list);
2135 mutex_unlock(&pinctrldev_list_mutex);
2137 pinctrl_init_device_debugfs(pctldev);
2141 EXPORT_SYMBOL_GPL(pinctrl_enable);
2144 * pinctrl_register() - register a pin controller device
2145 * @pctldesc: descriptor for this pin controller
2146 * @dev: parent device for this pin controller
2147 * @driver_data: private pin controller data for this pin controller
2149 * Note that pinctrl_register() is known to have problems as the pin
2150 * controller driver functions are called before the driver has a
2151 * struct pinctrl_dev handle. To avoid issues later on, please use the
2152 * new pinctrl_register_and_init() below instead.
2154 struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
2155 struct device *dev, void *driver_data)
2157 struct pinctrl_dev *pctldev;
2160 pctldev = pinctrl_init_controller(pctldesc, dev, driver_data);
2161 if (IS_ERR(pctldev))
2164 error = pinctrl_enable(pctldev);
2166 return ERR_PTR(error);
2170 EXPORT_SYMBOL_GPL(pinctrl_register);
2173 * pinctrl_register_and_init() - register and init pin controller device
2174 * @pctldesc: descriptor for this pin controller
2175 * @dev: parent device for this pin controller
2176 * @driver_data: private pin controller data for this pin controller
2177 * @pctldev: pin controller device
2179 * Note that pinctrl_enable() still needs to be manually called after
2180 * this once the driver is ready.
2182 int pinctrl_register_and_init(struct pinctrl_desc *pctldesc,
2183 struct device *dev, void *driver_data,
2184 struct pinctrl_dev **pctldev)
2186 struct pinctrl_dev *p;
2188 p = pinctrl_init_controller(pctldesc, dev, driver_data);
2193 * We have pinctrl_start() call functions in the pin controller
2194 * driver with create_pinctrl() for at least dt_node_to_map(). So
2195 * let's make sure pctldev is properly initialized for the
2196 * pin controller driver before we do anything.
2202 EXPORT_SYMBOL_GPL(pinctrl_register_and_init);
2205 * pinctrl_unregister() - unregister pinmux
2206 * @pctldev: pin controller to unregister
2208 * Called by pinmux drivers to unregister a pinmux.
2210 void pinctrl_unregister(struct pinctrl_dev *pctldev)
2212 struct pinctrl_gpio_range *range, *n;
2217 mutex_lock(&pctldev->mutex);
2218 pinctrl_remove_device_debugfs(pctldev);
2219 mutex_unlock(&pctldev->mutex);
2221 if (!IS_ERR_OR_NULL(pctldev->p))
2222 pinctrl_put(pctldev->p);
2224 mutex_lock(&pinctrldev_list_mutex);
2225 mutex_lock(&pctldev->mutex);
2226 /* TODO: check that no pinmuxes are still active? */
2227 list_del(&pctldev->node);
2228 pinmux_generic_free_functions(pctldev);
2229 pinctrl_generic_free_groups(pctldev);
2230 /* Destroy descriptor tree */
2231 pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
2232 pctldev->desc->npins);
2233 /* remove gpio ranges map */
2234 list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node)
2235 list_del(&range->node);
2237 mutex_unlock(&pctldev->mutex);
2238 mutex_destroy(&pctldev->mutex);
2240 mutex_unlock(&pinctrldev_list_mutex);
2242 EXPORT_SYMBOL_GPL(pinctrl_unregister);
2244 static void devm_pinctrl_dev_release(struct device *dev, void *res)
2246 struct pinctrl_dev *pctldev = *(struct pinctrl_dev **)res;
2248 pinctrl_unregister(pctldev);
2251 static int devm_pinctrl_dev_match(struct device *dev, void *res, void *data)
2253 struct pctldev **r = res;
2255 if (WARN_ON(!r || !*r))
2262 * devm_pinctrl_register() - Resource managed version of pinctrl_register().
2263 * @dev: parent device for this pin controller
2264 * @pctldesc: descriptor for this pin controller
2265 * @driver_data: private pin controller data for this pin controller
2267 * Returns an error pointer if pincontrol register failed. Otherwise
2268 * it returns valid pinctrl handle.
2270 * The pinctrl device will be automatically released when the device is unbound.
2272 struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
2273 struct pinctrl_desc *pctldesc,
2276 struct pinctrl_dev **ptr, *pctldev;
2278 ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL);
2280 return ERR_PTR(-ENOMEM);
2282 pctldev = pinctrl_register(pctldesc, dev, driver_data);
2283 if (IS_ERR(pctldev)) {
2289 devres_add(dev, ptr);
2293 EXPORT_SYMBOL_GPL(devm_pinctrl_register);
2296 * devm_pinctrl_register_and_init() - Resource managed pinctrl register and init
2297 * @dev: parent device for this pin controller
2298 * @pctldesc: descriptor for this pin controller
2299 * @driver_data: private pin controller data for this pin controller
2300 * @pctldev: pin controller device
2302 * Returns zero on success or an error number on failure.
2304 * The pinctrl device will be automatically released when the device is unbound.
2306 int devm_pinctrl_register_and_init(struct device *dev,
2307 struct pinctrl_desc *pctldesc,
2309 struct pinctrl_dev **pctldev)
2311 struct pinctrl_dev **ptr;
2314 ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL);
2318 error = pinctrl_register_and_init(pctldesc, dev, driver_data, pctldev);
2325 devres_add(dev, ptr);
2329 EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init);
2332 * devm_pinctrl_unregister() - Resource managed version of pinctrl_unregister().
2333 * @dev: device for which resource was allocated
2334 * @pctldev: the pinctrl device to unregister.
2336 void devm_pinctrl_unregister(struct device *dev, struct pinctrl_dev *pctldev)
2338 WARN_ON(devres_release(dev, devm_pinctrl_dev_release,
2339 devm_pinctrl_dev_match, pctldev));
2341 EXPORT_SYMBOL_GPL(devm_pinctrl_unregister);
2343 static int __init pinctrl_init(void)
2345 pr_info("initialized pinctrl subsystem\n");
2346 pinctrl_init_debugfs();
2350 /* init early since many drivers really need to initialized pinmux early */
2351 core_initcall(pinctrl_init);