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/debugfs.h>
16 #include <linux/device.h>
17 #include <linux/err.h>
18 #include <linux/export.h>
19 #include <linux/init.h>
20 #include <linux/kernel.h>
21 #include <linux/kref.h>
22 #include <linux/list.h>
23 #include <linux/seq_file.h>
24 #include <linux/slab.h>
26 #include <linux/pinctrl/consumer.h>
27 #include <linux/pinctrl/devinfo.h>
28 #include <linux/pinctrl/machine.h>
29 #include <linux/pinctrl/pinctrl.h>
32 #include "../gpio/gpiolib.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 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,
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,
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 * @gpio: gpio pin to translate to a pin number
272 * Finds the pin number for a given GPIO using the specified GPIO range
273 * as a base for translation. The distinction between linear GPIO ranges
274 * and pin list based GPIO ranges is managed correctly by this function.
276 * This function assumes the gpio is part of the specified GPIO range, use
277 * only after making sure this is the case (e.g. by calling it on the
278 * result of successful pinctrl_get_device_gpio_range calls)!
280 static inline int gpio_to_pin(struct pinctrl_gpio_range *range,
283 unsigned int offset = gpio - range->base;
285 return range->pins[offset];
287 return range->pin_base + offset;
291 * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
292 * @pctldev: pin controller device to check
293 * @gpio: gpio pin to check taken from the global GPIO pin space
295 * Tries to match a GPIO pin number to the ranges handled by a certain pin
296 * controller, return the range or NULL
298 static struct pinctrl_gpio_range *
299 pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
301 struct pinctrl_gpio_range *range;
303 mutex_lock(&pctldev->mutex);
304 /* Loop over the ranges */
305 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
306 /* Check if we're in the valid range */
307 if (gpio >= range->base &&
308 gpio < range->base + range->npins) {
309 mutex_unlock(&pctldev->mutex);
313 mutex_unlock(&pctldev->mutex);
318 * pinctrl_ready_for_gpio_range() - check if other GPIO pins of
319 * the same GPIO chip are in range
320 * @gpio: gpio pin to check taken from the global GPIO pin space
322 * This function is complement of pinctrl_match_gpio_range(). If the return
323 * value of pinctrl_match_gpio_range() is NULL, this function could be used
324 * to check whether pinctrl device is ready or not. Maybe some GPIO pins
325 * of the same GPIO chip don't have back-end pinctrl interface.
326 * If the return value is true, it means that pinctrl device is ready & the
327 * certain GPIO pin doesn't have back-end pinctrl device. If the return value
328 * is false, it means that pinctrl device may not be ready.
330 #ifdef CONFIG_GPIOLIB
331 static bool pinctrl_ready_for_gpio_range(unsigned gpio)
333 struct pinctrl_dev *pctldev;
334 struct pinctrl_gpio_range *range = NULL;
336 * FIXME: "gpio" here is a number in the global GPIO numberspace.
337 * get rid of this from the ranges eventually and get the GPIO
338 * descriptor from the gpio_chip.
340 struct gpio_chip *chip = gpiod_to_chip(gpio_to_desc(gpio));
342 if (WARN(!chip, "no gpio_chip for gpio%i?", gpio))
345 mutex_lock(&pinctrldev_list_mutex);
347 /* Loop over the pin controllers */
348 list_for_each_entry(pctldev, &pinctrldev_list, node) {
349 /* Loop over the ranges */
350 mutex_lock(&pctldev->mutex);
351 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
352 /* Check if any gpio range overlapped with gpio chip */
353 if (range->base + range->npins - 1 < chip->base ||
354 range->base > chip->base + chip->ngpio - 1)
356 mutex_unlock(&pctldev->mutex);
357 mutex_unlock(&pinctrldev_list_mutex);
360 mutex_unlock(&pctldev->mutex);
363 mutex_unlock(&pinctrldev_list_mutex);
368 static bool pinctrl_ready_for_gpio_range(unsigned gpio) { return true; }
372 * pinctrl_get_device_gpio_range() - find device for GPIO range
373 * @gpio: the pin to locate the pin controller for
374 * @outdev: the pin control device if found
375 * @outrange: the GPIO range if found
377 * Find the pin controller handling a certain GPIO pin from the pinspace of
378 * the GPIO subsystem, return the device and the matching GPIO range. Returns
379 * -EPROBE_DEFER if the GPIO range could not be found in any device since it
380 * may still have not been registered.
382 static int pinctrl_get_device_gpio_range(unsigned gpio,
383 struct pinctrl_dev **outdev,
384 struct pinctrl_gpio_range **outrange)
386 struct pinctrl_dev *pctldev;
388 mutex_lock(&pinctrldev_list_mutex);
390 /* Loop over the pin controllers */
391 list_for_each_entry(pctldev, &pinctrldev_list, node) {
392 struct pinctrl_gpio_range *range;
394 range = pinctrl_match_gpio_range(pctldev, gpio);
398 mutex_unlock(&pinctrldev_list_mutex);
403 mutex_unlock(&pinctrldev_list_mutex);
405 return -EPROBE_DEFER;
409 * pinctrl_add_gpio_range() - register a GPIO range for a controller
410 * @pctldev: pin controller device to add the range to
411 * @range: the GPIO range to add
413 * This adds a range of GPIOs to be handled by a certain pin controller. Call
414 * this to register handled ranges after registering your pin controller.
416 void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
417 struct pinctrl_gpio_range *range)
419 mutex_lock(&pctldev->mutex);
420 list_add_tail(&range->node, &pctldev->gpio_ranges);
421 mutex_unlock(&pctldev->mutex);
423 EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
425 void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
426 struct pinctrl_gpio_range *ranges,
431 for (i = 0; i < nranges; i++)
432 pinctrl_add_gpio_range(pctldev, &ranges[i]);
434 EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges);
436 struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
437 struct pinctrl_gpio_range *range)
439 struct pinctrl_dev *pctldev;
441 pctldev = get_pinctrl_dev_from_devname(devname);
444 * If we can't find this device, let's assume that is because
445 * it has not probed yet, so the driver trying to register this
446 * range need to defer probing.
449 return ERR_PTR(-EPROBE_DEFER);
451 pinctrl_add_gpio_range(pctldev, range);
455 EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range);
457 int pinctrl_get_group_pins(struct pinctrl_dev *pctldev, const char *pin_group,
458 const unsigned **pins, unsigned *num_pins)
460 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
463 if (!pctlops->get_group_pins)
466 gs = pinctrl_get_group_selector(pctldev, pin_group);
470 return pctlops->get_group_pins(pctldev, gs, pins, num_pins);
472 EXPORT_SYMBOL_GPL(pinctrl_get_group_pins);
474 struct pinctrl_gpio_range *
475 pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev,
478 struct pinctrl_gpio_range *range;
480 /* Loop over the ranges */
481 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
482 /* Check if we're in the valid range */
485 for (a = 0; a < range->npins; a++) {
486 if (range->pins[a] == pin)
489 } else if (pin >= range->pin_base &&
490 pin < range->pin_base + range->npins)
496 EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin_nolock);
499 * pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin
500 * @pctldev: the pin controller device to look in
501 * @pin: a controller-local number to find the range for
503 struct pinctrl_gpio_range *
504 pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
507 struct pinctrl_gpio_range *range;
509 mutex_lock(&pctldev->mutex);
510 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin);
511 mutex_unlock(&pctldev->mutex);
515 EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin);
518 * pinctrl_remove_gpio_range() - remove a range of GPIOs from a pin controller
519 * @pctldev: pin controller device to remove the range from
520 * @range: the GPIO range to remove
522 void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
523 struct pinctrl_gpio_range *range)
525 mutex_lock(&pctldev->mutex);
526 list_del(&range->node);
527 mutex_unlock(&pctldev->mutex);
529 EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range);
531 #ifdef CONFIG_GENERIC_PINCTRL_GROUPS
534 * pinctrl_generic_get_group_count() - returns the number of pin groups
535 * @pctldev: pin controller device
537 int pinctrl_generic_get_group_count(struct pinctrl_dev *pctldev)
539 return pctldev->num_groups;
541 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_count);
544 * pinctrl_generic_get_group_name() - returns the name of a pin group
545 * @pctldev: pin controller device
546 * @selector: group number
548 const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev,
549 unsigned int selector)
551 struct group_desc *group;
553 group = radix_tree_lookup(&pctldev->pin_group_tree,
560 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_name);
563 * pinctrl_generic_get_group_pins() - gets the pin group pins
564 * @pctldev: pin controller device
565 * @selector: group number
566 * @pins: pins in the group
567 * @num_pins: number of pins in the group
569 int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev,
570 unsigned int selector,
571 const unsigned int **pins,
572 unsigned int *num_pins)
574 struct group_desc *group;
576 group = radix_tree_lookup(&pctldev->pin_group_tree,
579 dev_err(pctldev->dev, "%s could not find pingroup%i\n",
585 *num_pins = group->num_pins;
589 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_pins);
592 * pinctrl_generic_get_group() - returns a pin group based on the number
593 * @pctldev: pin controller device
594 * @selector: group number
596 struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev,
597 unsigned int selector)
599 struct group_desc *group;
601 group = radix_tree_lookup(&pctldev->pin_group_tree,
608 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group);
610 static int pinctrl_generic_group_name_to_selector(struct pinctrl_dev *pctldev,
611 const char *function)
613 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
614 int ngroups = ops->get_groups_count(pctldev);
617 /* See if this pctldev has this group */
618 while (selector < ngroups) {
619 const char *gname = ops->get_group_name(pctldev, selector);
621 if (gname && !strcmp(function, gname))
631 * pinctrl_generic_add_group() - adds a new pin group
632 * @pctldev: pin controller device
633 * @name: name of the pin group
634 * @pins: pins in the pin group
635 * @num_pins: number of pins in the pin group
636 * @data: pin controller driver specific data
638 * Note that the caller must take care of locking.
640 int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name,
641 int *pins, int num_pins, void *data)
643 struct group_desc *group;
649 selector = pinctrl_generic_group_name_to_selector(pctldev, name);
653 selector = pctldev->num_groups;
655 group = devm_kzalloc(pctldev->dev, sizeof(*group), GFP_KERNEL);
661 group->num_pins = num_pins;
664 error = radix_tree_insert(&pctldev->pin_group_tree, selector, group);
668 pctldev->num_groups++;
672 EXPORT_SYMBOL_GPL(pinctrl_generic_add_group);
675 * pinctrl_generic_remove_group() - removes a numbered pin group
676 * @pctldev: pin controller device
677 * @selector: group number
679 * Note that the caller must take care of locking.
681 int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev,
682 unsigned int selector)
684 struct group_desc *group;
686 group = radix_tree_lookup(&pctldev->pin_group_tree,
691 radix_tree_delete(&pctldev->pin_group_tree, selector);
692 devm_kfree(pctldev->dev, group);
694 pctldev->num_groups--;
698 EXPORT_SYMBOL_GPL(pinctrl_generic_remove_group);
701 * pinctrl_generic_free_groups() - removes all pin groups
702 * @pctldev: pin controller device
704 * Note that the caller must take care of locking. The pinctrl groups
705 * are allocated with devm_kzalloc() so no need to free them here.
707 static void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev)
709 struct radix_tree_iter iter;
712 radix_tree_for_each_slot(slot, &pctldev->pin_group_tree, &iter, 0)
713 radix_tree_delete(&pctldev->pin_group_tree, iter.index);
715 pctldev->num_groups = 0;
719 static inline void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev)
722 #endif /* CONFIG_GENERIC_PINCTRL_GROUPS */
725 * pinctrl_get_group_selector() - returns the group selector for a group
726 * @pctldev: the pin controller handling the group
727 * @pin_group: the pin group to look up
729 int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
730 const char *pin_group)
732 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
733 unsigned ngroups = pctlops->get_groups_count(pctldev);
734 unsigned group_selector = 0;
736 while (group_selector < ngroups) {
737 const char *gname = pctlops->get_group_name(pctldev,
739 if (gname && !strcmp(gname, pin_group)) {
740 dev_dbg(pctldev->dev,
741 "found group selector %u for %s\n",
744 return group_selector;
750 dev_err(pctldev->dev, "does not have pin group %s\n",
756 bool pinctrl_gpio_can_use_line(unsigned gpio)
758 struct pinctrl_dev *pctldev;
759 struct pinctrl_gpio_range *range;
764 * Try to obtain GPIO range, if it fails
765 * we're probably dealing with GPIO driver
766 * without a backing pin controller - bail out.
768 if (pinctrl_get_device_gpio_range(gpio, &pctldev, &range))
771 mutex_lock(&pctldev->mutex);
773 /* Convert to the pin controllers number space */
774 pin = gpio_to_pin(range, gpio);
776 result = pinmux_can_be_used_for_gpio(pctldev, pin);
778 mutex_unlock(&pctldev->mutex);
782 EXPORT_SYMBOL_GPL(pinctrl_gpio_can_use_line);
785 * pinctrl_gpio_request() - request a single pin to be used as GPIO
786 * @gpio: the GPIO pin number from the GPIO subsystem number space
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(unsigned gpio)
794 struct pinctrl_dev *pctldev;
795 struct pinctrl_gpio_range *range;
799 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
801 if (pinctrl_ready_for_gpio_range(gpio))
806 mutex_lock(&pctldev->mutex);
808 /* Convert to the pin controllers number space */
809 pin = gpio_to_pin(range, gpio);
811 ret = pinmux_request_gpio(pctldev, range, pin, gpio);
813 mutex_unlock(&pctldev->mutex);
817 EXPORT_SYMBOL_GPL(pinctrl_gpio_request);
820 * pinctrl_gpio_free() - free control on a single pin, currently used as GPIO
821 * @gpio: the GPIO pin number from the GPIO subsystem number space
823 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
824 * as part of their gpio_free() semantics, platforms and individual drivers
825 * shall *NOT* request GPIO pins to be muxed out.
827 void pinctrl_gpio_free(unsigned gpio)
829 struct pinctrl_dev *pctldev;
830 struct pinctrl_gpio_range *range;
834 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
838 mutex_lock(&pctldev->mutex);
840 /* Convert to the pin controllers number space */
841 pin = gpio_to_pin(range, gpio);
843 pinmux_free_gpio(pctldev, pin, range);
845 mutex_unlock(&pctldev->mutex);
847 EXPORT_SYMBOL_GPL(pinctrl_gpio_free);
849 static int pinctrl_gpio_direction(unsigned gpio, bool input)
851 struct pinctrl_dev *pctldev;
852 struct pinctrl_gpio_range *range;
856 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
861 mutex_lock(&pctldev->mutex);
863 /* Convert to the pin controllers number space */
864 pin = gpio_to_pin(range, gpio);
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 * @gpio: the GPIO pin number from the GPIO subsystem number space
876 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
877 * as part of their gpio_direction_input() semantics, platforms and individual
878 * drivers shall *NOT* touch pin control GPIO calls.
880 int pinctrl_gpio_direction_input(unsigned gpio)
882 return pinctrl_gpio_direction(gpio, true);
884 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
887 * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode
888 * @gpio: the GPIO pin number from the GPIO subsystem number space
890 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
891 * as part of their gpio_direction_output() semantics, platforms and individual
892 * drivers shall *NOT* touch pin control GPIO calls.
894 int pinctrl_gpio_direction_output(unsigned gpio)
896 return pinctrl_gpio_direction(gpio, false);
898 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
901 * pinctrl_gpio_set_config() - Apply config to given GPIO pin
902 * @gpio: the GPIO pin number from the GPIO subsystem number space
903 * @config: the configuration to apply to the GPIO
905 * This function should *ONLY* be used from gpiolib-based GPIO drivers, if
906 * they need to call the underlying pin controller to change GPIO config
907 * (for example set debounce time).
909 int pinctrl_gpio_set_config(unsigned gpio, unsigned long config)
911 unsigned long configs[] = { config };
912 struct pinctrl_gpio_range *range;
913 struct pinctrl_dev *pctldev;
916 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
920 mutex_lock(&pctldev->mutex);
921 pin = gpio_to_pin(range, gpio);
922 ret = pinconf_set_config(pctldev, pin, configs, ARRAY_SIZE(configs));
923 mutex_unlock(&pctldev->mutex);
927 EXPORT_SYMBOL_GPL(pinctrl_gpio_set_config);
929 static struct pinctrl_state *find_state(struct pinctrl *p,
932 struct pinctrl_state *state;
934 list_for_each_entry(state, &p->states, node)
935 if (!strcmp(state->name, name))
941 static struct pinctrl_state *create_state(struct pinctrl *p,
944 struct pinctrl_state *state;
946 state = kzalloc(sizeof(*state), GFP_KERNEL);
948 return ERR_PTR(-ENOMEM);
951 INIT_LIST_HEAD(&state->settings);
953 list_add_tail(&state->node, &p->states);
958 static int add_setting(struct pinctrl *p, struct pinctrl_dev *pctldev,
959 const struct pinctrl_map *map)
961 struct pinctrl_state *state;
962 struct pinctrl_setting *setting;
965 state = find_state(p, map->name);
967 state = create_state(p, map->name);
969 return PTR_ERR(state);
971 if (map->type == PIN_MAP_TYPE_DUMMY_STATE)
974 setting = kzalloc(sizeof(*setting), GFP_KERNEL);
978 setting->type = map->type;
981 setting->pctldev = pctldev;
984 get_pinctrl_dev_from_devname(map->ctrl_dev_name);
985 if (!setting->pctldev) {
987 /* Do not defer probing of hogs (circular loop) */
988 if (!strcmp(map->ctrl_dev_name, map->dev_name))
991 * OK let us guess that the driver is not there yet, and
992 * let's defer obtaining this pinctrl handle to later...
994 dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe",
996 return -EPROBE_DEFER;
999 setting->dev_name = map->dev_name;
1001 switch (map->type) {
1002 case PIN_MAP_TYPE_MUX_GROUP:
1003 ret = pinmux_map_to_setting(map, setting);
1005 case PIN_MAP_TYPE_CONFIGS_PIN:
1006 case PIN_MAP_TYPE_CONFIGS_GROUP:
1007 ret = pinconf_map_to_setting(map, setting);
1018 list_add_tail(&setting->node, &state->settings);
1023 static struct pinctrl *find_pinctrl(struct device *dev)
1025 struct pinctrl *entry, *p = NULL;
1027 mutex_lock(&pinctrl_list_mutex);
1029 list_for_each_entry(entry, &pinctrl_list, node) {
1030 if (entry->dev == dev) {
1032 kref_get(&p->users);
1037 mutex_unlock(&pinctrl_list_mutex);
1041 static void pinctrl_free(struct pinctrl *p, bool inlist);
1043 static struct pinctrl *create_pinctrl(struct device *dev,
1044 struct pinctrl_dev *pctldev)
1047 const char *devname;
1048 struct pinctrl_maps *maps_node;
1049 const struct pinctrl_map *map;
1053 * create the state cookie holder struct pinctrl for each
1054 * mapping, this is what consumers will get when requesting
1055 * a pin control handle with pinctrl_get()
1057 p = kzalloc(sizeof(*p), GFP_KERNEL);
1059 return ERR_PTR(-ENOMEM);
1061 INIT_LIST_HEAD(&p->states);
1062 INIT_LIST_HEAD(&p->dt_maps);
1064 ret = pinctrl_dt_to_map(p, pctldev);
1067 return ERR_PTR(ret);
1070 devname = dev_name(dev);
1072 mutex_lock(&pinctrl_maps_mutex);
1073 /* Iterate over the pin control maps to locate the right ones */
1074 for_each_pin_map(maps_node, map) {
1075 /* Map must be for this device */
1076 if (strcmp(map->dev_name, devname))
1079 * If pctldev is not null, we are claiming hog for it,
1080 * that means, setting that is served by pctldev by itself.
1082 * Thus we must skip map that is for this device but is served
1086 strcmp(dev_name(pctldev->dev), map->ctrl_dev_name))
1089 ret = add_setting(p, pctldev, map);
1091 * At this point the adding of a setting may:
1093 * - Defer, if the pinctrl device is not yet available
1094 * - Fail, if the pinctrl device is not yet available,
1095 * AND the setting is a hog. We cannot defer that, since
1096 * the hog will kick in immediately after the device
1099 * If the error returned was not -EPROBE_DEFER then we
1100 * accumulate the errors to see if we end up with
1101 * an -EPROBE_DEFER later, as that is the worst case.
1103 if (ret == -EPROBE_DEFER) {
1104 pinctrl_free(p, false);
1105 mutex_unlock(&pinctrl_maps_mutex);
1106 return ERR_PTR(ret);
1109 mutex_unlock(&pinctrl_maps_mutex);
1112 /* If some other error than deferral occurred, return here */
1113 pinctrl_free(p, false);
1114 return ERR_PTR(ret);
1117 kref_init(&p->users);
1119 /* Add the pinctrl handle to the global list */
1120 mutex_lock(&pinctrl_list_mutex);
1121 list_add_tail(&p->node, &pinctrl_list);
1122 mutex_unlock(&pinctrl_list_mutex);
1128 * pinctrl_get() - retrieves the pinctrl handle for a device
1129 * @dev: the device to obtain the handle for
1131 struct pinctrl *pinctrl_get(struct device *dev)
1136 return ERR_PTR(-EINVAL);
1139 * See if somebody else (such as the device core) has already
1140 * obtained a handle to the pinctrl for this device. In that case,
1141 * return another pointer to it.
1143 p = find_pinctrl(dev);
1145 dev_dbg(dev, "obtain a copy of previously claimed pinctrl\n");
1149 return create_pinctrl(dev, NULL);
1151 EXPORT_SYMBOL_GPL(pinctrl_get);
1153 static void pinctrl_free_setting(bool disable_setting,
1154 struct pinctrl_setting *setting)
1156 switch (setting->type) {
1157 case PIN_MAP_TYPE_MUX_GROUP:
1158 if (disable_setting)
1159 pinmux_disable_setting(setting);
1160 pinmux_free_setting(setting);
1162 case PIN_MAP_TYPE_CONFIGS_PIN:
1163 case PIN_MAP_TYPE_CONFIGS_GROUP:
1164 pinconf_free_setting(setting);
1171 static void pinctrl_free(struct pinctrl *p, bool inlist)
1173 struct pinctrl_state *state, *n1;
1174 struct pinctrl_setting *setting, *n2;
1176 mutex_lock(&pinctrl_list_mutex);
1177 list_for_each_entry_safe(state, n1, &p->states, node) {
1178 list_for_each_entry_safe(setting, n2, &state->settings, node) {
1179 pinctrl_free_setting(state == p->state, setting);
1180 list_del(&setting->node);
1183 list_del(&state->node);
1187 pinctrl_dt_free_maps(p);
1192 mutex_unlock(&pinctrl_list_mutex);
1196 * pinctrl_release() - release the pinctrl handle
1197 * @kref: the kref in the pinctrl being released
1199 static void pinctrl_release(struct kref *kref)
1201 struct pinctrl *p = container_of(kref, struct pinctrl, users);
1203 pinctrl_free(p, true);
1207 * pinctrl_put() - decrease use count on a previously claimed pinctrl handle
1208 * @p: the pinctrl handle to release
1210 void pinctrl_put(struct pinctrl *p)
1212 kref_put(&p->users, pinctrl_release);
1214 EXPORT_SYMBOL_GPL(pinctrl_put);
1217 * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle
1218 * @p: the pinctrl handle to retrieve the state from
1219 * @name: the state name to retrieve
1221 struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p,
1224 struct pinctrl_state *state;
1226 state = find_state(p, name);
1228 if (pinctrl_dummy_state) {
1229 /* create dummy state */
1230 dev_dbg(p->dev, "using pinctrl dummy state (%s)\n",
1232 state = create_state(p, name);
1234 state = ERR_PTR(-ENODEV);
1239 EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
1241 static void pinctrl_link_add(struct pinctrl_dev *pctldev,
1242 struct device *consumer)
1244 if (pctldev->desc->link_consumers)
1245 device_link_add(consumer, pctldev->dev,
1246 DL_FLAG_PM_RUNTIME |
1247 DL_FLAG_AUTOREMOVE_CONSUMER);
1251 * pinctrl_commit_state() - select/activate/program a pinctrl state to HW
1252 * @p: the pinctrl handle for the device that requests configuration
1253 * @state: the state handle to select/activate/program
1255 static int pinctrl_commit_state(struct pinctrl *p, struct pinctrl_state *state)
1257 struct pinctrl_setting *setting, *setting2;
1258 struct pinctrl_state *old_state = p->state;
1263 * For each pinmux setting in the old state, forget SW's record
1264 * of mux owner for that pingroup. Any pingroups which are
1265 * still owned by the new state will be re-acquired by the call
1266 * to pinmux_enable_setting() in the loop below.
1268 list_for_each_entry(setting, &p->state->settings, node) {
1269 if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
1271 pinmux_disable_setting(setting);
1277 /* Apply all the settings for the new state - pinmux first */
1278 list_for_each_entry(setting, &state->settings, node) {
1279 switch (setting->type) {
1280 case PIN_MAP_TYPE_MUX_GROUP:
1281 ret = pinmux_enable_setting(setting);
1283 case PIN_MAP_TYPE_CONFIGS_PIN:
1284 case PIN_MAP_TYPE_CONFIGS_GROUP:
1293 goto unapply_new_state;
1295 /* Do not link hogs (circular dependency) */
1296 if (p != setting->pctldev->p)
1297 pinctrl_link_add(setting->pctldev, p->dev);
1300 /* Apply all the settings for the new state - pinconf after */
1301 list_for_each_entry(setting, &state->settings, node) {
1302 switch (setting->type) {
1303 case PIN_MAP_TYPE_MUX_GROUP:
1306 case PIN_MAP_TYPE_CONFIGS_PIN:
1307 case PIN_MAP_TYPE_CONFIGS_GROUP:
1308 ret = pinconf_apply_setting(setting);
1316 goto unapply_new_state;
1319 /* Do not link hogs (circular dependency) */
1320 if (p != setting->pctldev->p)
1321 pinctrl_link_add(setting->pctldev, p->dev);
1329 dev_err(p->dev, "Error applying setting, reverse things back\n");
1331 list_for_each_entry(setting2, &state->settings, node) {
1332 if (&setting2->node == &setting->node)
1335 * All we can do here is pinmux_disable_setting.
1336 * That means that some pins are muxed differently now
1337 * than they were before applying the setting (We can't
1338 * "unmux a pin"!), but it's not a big deal since the pins
1339 * are free to be muxed by another apply_setting.
1341 if (setting2->type == PIN_MAP_TYPE_MUX_GROUP)
1342 pinmux_disable_setting(setting2);
1345 /* There's no infinite recursive loop here because p->state is NULL */
1347 pinctrl_select_state(p, old_state);
1353 * pinctrl_select_state() - select/activate/program a pinctrl state to HW
1354 * @p: the pinctrl handle for the device that requests configuration
1355 * @state: the state handle to select/activate/program
1357 int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
1359 if (p->state == state)
1362 return pinctrl_commit_state(p, state);
1364 EXPORT_SYMBOL_GPL(pinctrl_select_state);
1366 static void devm_pinctrl_release(struct device *dev, void *res)
1368 pinctrl_put(*(struct pinctrl **)res);
1372 * devm_pinctrl_get() - Resource managed pinctrl_get()
1373 * @dev: the device to obtain the handle for
1375 * If there is a need to explicitly destroy the returned struct pinctrl,
1376 * devm_pinctrl_put() should be used, rather than plain pinctrl_put().
1378 struct pinctrl *devm_pinctrl_get(struct device *dev)
1380 struct pinctrl **ptr, *p;
1382 ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL);
1384 return ERR_PTR(-ENOMEM);
1386 p = pinctrl_get(dev);
1389 devres_add(dev, ptr);
1396 EXPORT_SYMBOL_GPL(devm_pinctrl_get);
1398 static int devm_pinctrl_match(struct device *dev, void *res, void *data)
1400 struct pinctrl **p = res;
1406 * devm_pinctrl_put() - Resource managed pinctrl_put()
1407 * @p: the pinctrl handle to release
1409 * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally
1410 * this function will not need to be called and the resource management
1411 * code will ensure that the resource is freed.
1413 void devm_pinctrl_put(struct pinctrl *p)
1415 WARN_ON(devres_release(p->dev, devm_pinctrl_release,
1416 devm_pinctrl_match, p));
1418 EXPORT_SYMBOL_GPL(devm_pinctrl_put);
1421 * pinctrl_register_mappings() - register a set of pin controller mappings
1422 * @maps: the pincontrol mappings table to register. Note the pinctrl-core
1423 * keeps a reference to the passed in maps, so they should _not_ be
1424 * marked with __initdata.
1425 * @num_maps: the number of maps in the mapping table
1427 int pinctrl_register_mappings(const struct pinctrl_map *maps,
1431 struct pinctrl_maps *maps_node;
1433 pr_debug("add %u pinctrl maps\n", num_maps);
1435 /* First sanity check the new mapping */
1436 for (i = 0; i < num_maps; i++) {
1437 if (!maps[i].dev_name) {
1438 pr_err("failed to register map %s (%d): no device given\n",
1443 if (!maps[i].name) {
1444 pr_err("failed to register map %d: no map name given\n",
1449 if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE &&
1450 !maps[i].ctrl_dev_name) {
1451 pr_err("failed to register map %s (%d): no pin control device given\n",
1456 switch (maps[i].type) {
1457 case PIN_MAP_TYPE_DUMMY_STATE:
1459 case PIN_MAP_TYPE_MUX_GROUP:
1460 ret = pinmux_validate_map(&maps[i], i);
1464 case PIN_MAP_TYPE_CONFIGS_PIN:
1465 case PIN_MAP_TYPE_CONFIGS_GROUP:
1466 ret = pinconf_validate_map(&maps[i], i);
1471 pr_err("failed to register map %s (%d): invalid type given\n",
1477 maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL);
1481 maps_node->maps = maps;
1482 maps_node->num_maps = num_maps;
1484 mutex_lock(&pinctrl_maps_mutex);
1485 list_add_tail(&maps_node->node, &pinctrl_maps);
1486 mutex_unlock(&pinctrl_maps_mutex);
1490 EXPORT_SYMBOL_GPL(pinctrl_register_mappings);
1493 * pinctrl_unregister_mappings() - unregister a set of pin controller mappings
1494 * @map: the pincontrol mappings table passed to pinctrl_register_mappings()
1495 * when registering the mappings.
1497 void pinctrl_unregister_mappings(const struct pinctrl_map *map)
1499 struct pinctrl_maps *maps_node;
1501 mutex_lock(&pinctrl_maps_mutex);
1502 list_for_each_entry(maps_node, &pinctrl_maps, node) {
1503 if (maps_node->maps == map) {
1504 list_del(&maps_node->node);
1506 mutex_unlock(&pinctrl_maps_mutex);
1510 mutex_unlock(&pinctrl_maps_mutex);
1512 EXPORT_SYMBOL_GPL(pinctrl_unregister_mappings);
1515 * pinctrl_force_sleep() - turn a given controller device into sleep state
1516 * @pctldev: pin controller device
1518 int pinctrl_force_sleep(struct pinctrl_dev *pctldev)
1520 if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_sleep))
1521 return pinctrl_commit_state(pctldev->p, pctldev->hog_sleep);
1524 EXPORT_SYMBOL_GPL(pinctrl_force_sleep);
1527 * pinctrl_force_default() - turn a given controller device into default state
1528 * @pctldev: pin controller device
1530 int pinctrl_force_default(struct pinctrl_dev *pctldev)
1532 if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_default))
1533 return pinctrl_commit_state(pctldev->p, pctldev->hog_default);
1536 EXPORT_SYMBOL_GPL(pinctrl_force_default);
1539 * pinctrl_init_done() - tell pinctrl probe is done
1541 * We'll use this time to switch the pins from "init" to "default" unless the
1542 * driver selected some other state.
1544 * @dev: device to that's done probing
1546 int pinctrl_init_done(struct device *dev)
1548 struct dev_pin_info *pins = dev->pins;
1554 if (IS_ERR(pins->init_state))
1555 return 0; /* No such state */
1557 if (pins->p->state != pins->init_state)
1558 return 0; /* Not at init anyway */
1560 if (IS_ERR(pins->default_state))
1561 return 0; /* No default state */
1563 ret = pinctrl_select_state(pins->p, pins->default_state);
1565 dev_err(dev, "failed to activate default pinctrl state\n");
1570 static int pinctrl_select_bound_state(struct device *dev,
1571 struct pinctrl_state *state)
1573 struct dev_pin_info *pins = dev->pins;
1577 return 0; /* No such state */
1578 ret = pinctrl_select_state(pins->p, state);
1580 dev_err(dev, "failed to activate pinctrl state %s\n",
1586 * pinctrl_select_default_state() - select default pinctrl state
1587 * @dev: device to select default state for
1589 int pinctrl_select_default_state(struct device *dev)
1594 return pinctrl_select_bound_state(dev, dev->pins->default_state);
1596 EXPORT_SYMBOL_GPL(pinctrl_select_default_state);
1601 * pinctrl_pm_select_default_state() - select default pinctrl state for PM
1602 * @dev: device to select default state for
1604 int pinctrl_pm_select_default_state(struct device *dev)
1606 return pinctrl_select_default_state(dev);
1608 EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state);
1611 * pinctrl_pm_select_sleep_state() - select sleep pinctrl state for PM
1612 * @dev: device to select sleep state for
1614 int pinctrl_pm_select_sleep_state(struct device *dev)
1619 return pinctrl_select_bound_state(dev, dev->pins->sleep_state);
1621 EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state);
1624 * pinctrl_pm_select_idle_state() - select idle pinctrl state for PM
1625 * @dev: device to select idle state for
1627 int pinctrl_pm_select_idle_state(struct device *dev)
1632 return pinctrl_select_bound_state(dev, dev->pins->idle_state);
1634 EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state);
1637 #ifdef CONFIG_DEBUG_FS
1639 static int pinctrl_pins_show(struct seq_file *s, void *what)
1641 struct pinctrl_dev *pctldev = s->private;
1642 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1644 #ifdef CONFIG_GPIOLIB
1645 struct pinctrl_gpio_range *range;
1646 struct gpio_chip *chip;
1650 seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
1652 mutex_lock(&pctldev->mutex);
1654 /* The pin number can be retrived from the pin controller descriptor */
1655 for (i = 0; i < pctldev->desc->npins; i++) {
1656 struct pin_desc *desc;
1658 pin = pctldev->desc->pins[i].number;
1659 desc = pin_desc_get(pctldev, pin);
1660 /* Pin space may be sparse */
1664 seq_printf(s, "pin %d (%s) ", pin, desc->name);
1666 #ifdef CONFIG_GPIOLIB
1668 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
1669 if ((pin >= range->pin_base) &&
1670 (pin < (range->pin_base + range->npins))) {
1671 gpio_num = range->base + (pin - range->pin_base);
1677 * FIXME: gpio_num comes from the global GPIO numberspace.
1678 * we need to get rid of the range->base eventually and
1679 * get the descriptor directly from the gpio_chip.
1681 chip = gpiod_to_chip(gpio_to_desc(gpio_num));
1685 seq_printf(s, "%u:%s ", gpio_num - chip->gpiodev->base, chip->label);
1687 seq_puts(s, "0:? ");
1690 /* Driver-specific info per pin */
1691 if (ops->pin_dbg_show)
1692 ops->pin_dbg_show(pctldev, s, pin);
1697 mutex_unlock(&pctldev->mutex);
1701 DEFINE_SHOW_ATTRIBUTE(pinctrl_pins);
1703 static int pinctrl_groups_show(struct seq_file *s, void *what)
1705 struct pinctrl_dev *pctldev = s->private;
1706 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1707 unsigned ngroups, selector = 0;
1709 mutex_lock(&pctldev->mutex);
1711 ngroups = ops->get_groups_count(pctldev);
1713 seq_puts(s, "registered pin groups:\n");
1714 while (selector < ngroups) {
1715 const unsigned *pins = NULL;
1716 unsigned num_pins = 0;
1717 const char *gname = ops->get_group_name(pctldev, selector);
1722 if (ops->get_group_pins)
1723 ret = ops->get_group_pins(pctldev, selector,
1726 seq_printf(s, "%s [ERROR GETTING PINS]\n",
1729 seq_printf(s, "group: %s\n", gname);
1730 for (i = 0; i < num_pins; i++) {
1731 pname = pin_get_name(pctldev, pins[i]);
1732 if (WARN_ON(!pname)) {
1733 mutex_unlock(&pctldev->mutex);
1736 seq_printf(s, "pin %d (%s)\n", pins[i], pname);
1743 mutex_unlock(&pctldev->mutex);
1747 DEFINE_SHOW_ATTRIBUTE(pinctrl_groups);
1749 static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
1751 struct pinctrl_dev *pctldev = s->private;
1752 struct pinctrl_gpio_range *range;
1754 seq_puts(s, "GPIO ranges handled:\n");
1756 mutex_lock(&pctldev->mutex);
1758 /* Loop over the ranges */
1759 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
1762 seq_printf(s, "%u: %s GPIOS [%u - %u] PINS {",
1763 range->id, range->name,
1764 range->base, (range->base + range->npins - 1));
1765 for (a = 0; a < range->npins - 1; a++)
1766 seq_printf(s, "%u, ", range->pins[a]);
1767 seq_printf(s, "%u}\n", range->pins[a]);
1770 seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
1771 range->id, range->name,
1772 range->base, (range->base + range->npins - 1),
1774 (range->pin_base + range->npins - 1));
1777 mutex_unlock(&pctldev->mutex);
1781 DEFINE_SHOW_ATTRIBUTE(pinctrl_gpioranges);
1783 static int pinctrl_devices_show(struct seq_file *s, void *what)
1785 struct pinctrl_dev *pctldev;
1787 seq_puts(s, "name [pinmux] [pinconf]\n");
1789 mutex_lock(&pinctrldev_list_mutex);
1791 list_for_each_entry(pctldev, &pinctrldev_list, node) {
1792 seq_printf(s, "%s ", pctldev->desc->name);
1793 if (pctldev->desc->pmxops)
1794 seq_puts(s, "yes ");
1797 if (pctldev->desc->confops)
1804 mutex_unlock(&pinctrldev_list_mutex);
1808 DEFINE_SHOW_ATTRIBUTE(pinctrl_devices);
1810 static inline const char *map_type(enum pinctrl_map_type type)
1812 static const char * const names[] = {
1820 if (type >= ARRAY_SIZE(names))
1826 static int pinctrl_maps_show(struct seq_file *s, void *what)
1828 struct pinctrl_maps *maps_node;
1829 const struct pinctrl_map *map;
1831 seq_puts(s, "Pinctrl maps:\n");
1833 mutex_lock(&pinctrl_maps_mutex);
1834 for_each_pin_map(maps_node, map) {
1835 seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n",
1836 map->dev_name, map->name, map_type(map->type),
1839 if (map->type != PIN_MAP_TYPE_DUMMY_STATE)
1840 seq_printf(s, "controlling device %s\n",
1841 map->ctrl_dev_name);
1843 switch (map->type) {
1844 case PIN_MAP_TYPE_MUX_GROUP:
1845 pinmux_show_map(s, map);
1847 case PIN_MAP_TYPE_CONFIGS_PIN:
1848 case PIN_MAP_TYPE_CONFIGS_GROUP:
1849 pinconf_show_map(s, map);
1857 mutex_unlock(&pinctrl_maps_mutex);
1861 DEFINE_SHOW_ATTRIBUTE(pinctrl_maps);
1863 static int pinctrl_show(struct seq_file *s, void *what)
1866 struct pinctrl_state *state;
1867 struct pinctrl_setting *setting;
1869 seq_puts(s, "Requested pin control handlers their pinmux maps:\n");
1871 mutex_lock(&pinctrl_list_mutex);
1873 list_for_each_entry(p, &pinctrl_list, node) {
1874 seq_printf(s, "device: %s current state: %s\n",
1876 p->state ? p->state->name : "none");
1878 list_for_each_entry(state, &p->states, node) {
1879 seq_printf(s, " state: %s\n", state->name);
1881 list_for_each_entry(setting, &state->settings, node) {
1882 struct pinctrl_dev *pctldev = setting->pctldev;
1884 seq_printf(s, " type: %s controller %s ",
1885 map_type(setting->type),
1886 pinctrl_dev_get_name(pctldev));
1888 switch (setting->type) {
1889 case PIN_MAP_TYPE_MUX_GROUP:
1890 pinmux_show_setting(s, setting);
1892 case PIN_MAP_TYPE_CONFIGS_PIN:
1893 case PIN_MAP_TYPE_CONFIGS_GROUP:
1894 pinconf_show_setting(s, setting);
1903 mutex_unlock(&pinctrl_list_mutex);
1907 DEFINE_SHOW_ATTRIBUTE(pinctrl);
1909 static struct dentry *debugfs_root;
1911 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1913 struct dentry *device_root;
1914 const char *debugfs_name;
1916 if (pctldev->desc->name &&
1917 strcmp(dev_name(pctldev->dev), pctldev->desc->name)) {
1918 debugfs_name = devm_kasprintf(pctldev->dev, GFP_KERNEL,
1919 "%s-%s", dev_name(pctldev->dev),
1920 pctldev->desc->name);
1921 if (!debugfs_name) {
1922 pr_warn("failed to determine debugfs dir name for %s\n",
1923 dev_name(pctldev->dev));
1927 debugfs_name = dev_name(pctldev->dev);
1930 device_root = debugfs_create_dir(debugfs_name, debugfs_root);
1931 pctldev->device_root = device_root;
1933 if (IS_ERR(device_root) || !device_root) {
1934 pr_warn("failed to create debugfs directory for %s\n",
1935 dev_name(pctldev->dev));
1938 debugfs_create_file("pins", 0444,
1939 device_root, pctldev, &pinctrl_pins_fops);
1940 debugfs_create_file("pingroups", 0444,
1941 device_root, pctldev, &pinctrl_groups_fops);
1942 debugfs_create_file("gpio-ranges", 0444,
1943 device_root, pctldev, &pinctrl_gpioranges_fops);
1944 if (pctldev->desc->pmxops)
1945 pinmux_init_device_debugfs(device_root, pctldev);
1946 if (pctldev->desc->confops)
1947 pinconf_init_device_debugfs(device_root, pctldev);
1950 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1952 debugfs_remove_recursive(pctldev->device_root);
1955 static void pinctrl_init_debugfs(void)
1957 debugfs_root = debugfs_create_dir("pinctrl", NULL);
1958 if (IS_ERR(debugfs_root) || !debugfs_root) {
1959 pr_warn("failed to create debugfs directory\n");
1960 debugfs_root = NULL;
1964 debugfs_create_file("pinctrl-devices", 0444,
1965 debugfs_root, NULL, &pinctrl_devices_fops);
1966 debugfs_create_file("pinctrl-maps", 0444,
1967 debugfs_root, NULL, &pinctrl_maps_fops);
1968 debugfs_create_file("pinctrl-handles", 0444,
1969 debugfs_root, NULL, &pinctrl_fops);
1972 #else /* CONFIG_DEBUG_FS */
1974 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1978 static void pinctrl_init_debugfs(void)
1982 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1988 static int pinctrl_check_ops(struct pinctrl_dev *pctldev)
1990 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1993 !ops->get_groups_count ||
1994 !ops->get_group_name)
2001 * pinctrl_init_controller() - init a pin controller device
2002 * @pctldesc: descriptor for this pin controller
2003 * @dev: parent device for this pin controller
2004 * @driver_data: private pin controller data for this pin controller
2006 static struct pinctrl_dev *
2007 pinctrl_init_controller(struct pinctrl_desc *pctldesc, struct device *dev,
2010 struct pinctrl_dev *pctldev;
2014 return ERR_PTR(-EINVAL);
2015 if (!pctldesc->name)
2016 return ERR_PTR(-EINVAL);
2018 pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL);
2020 return ERR_PTR(-ENOMEM);
2022 /* Initialize pin control device struct */
2023 pctldev->owner = pctldesc->owner;
2024 pctldev->desc = pctldesc;
2025 pctldev->driver_data = driver_data;
2026 INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
2027 #ifdef CONFIG_GENERIC_PINCTRL_GROUPS
2028 INIT_RADIX_TREE(&pctldev->pin_group_tree, GFP_KERNEL);
2030 #ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS
2031 INIT_RADIX_TREE(&pctldev->pin_function_tree, GFP_KERNEL);
2033 INIT_LIST_HEAD(&pctldev->gpio_ranges);
2034 INIT_LIST_HEAD(&pctldev->node);
2036 mutex_init(&pctldev->mutex);
2038 /* check core ops for sanity */
2039 ret = pinctrl_check_ops(pctldev);
2041 dev_err(dev, "pinctrl ops lacks necessary functions\n");
2045 /* If we're implementing pinmuxing, check the ops for sanity */
2046 if (pctldesc->pmxops) {
2047 ret = pinmux_check_ops(pctldev);
2052 /* If we're implementing pinconfig, check the ops for sanity */
2053 if (pctldesc->confops) {
2054 ret = pinconf_check_ops(pctldev);
2059 /* Register all the pins */
2060 dev_dbg(dev, "try to register %d pins ...\n", pctldesc->npins);
2061 ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins);
2063 dev_err(dev, "error during pin registration\n");
2064 pinctrl_free_pindescs(pctldev, pctldesc->pins,
2072 mutex_destroy(&pctldev->mutex);
2074 return ERR_PTR(ret);
2077 static int pinctrl_claim_hogs(struct pinctrl_dev *pctldev)
2079 pctldev->p = create_pinctrl(pctldev->dev, pctldev);
2080 if (PTR_ERR(pctldev->p) == -ENODEV) {
2081 dev_dbg(pctldev->dev, "no hogs found\n");
2086 if (IS_ERR(pctldev->p)) {
2087 dev_err(pctldev->dev, "error claiming hogs: %li\n",
2088 PTR_ERR(pctldev->p));
2090 return PTR_ERR(pctldev->p);
2093 pctldev->hog_default =
2094 pinctrl_lookup_state(pctldev->p, PINCTRL_STATE_DEFAULT);
2095 if (IS_ERR(pctldev->hog_default)) {
2096 dev_dbg(pctldev->dev,
2097 "failed to lookup the default state\n");
2099 if (pinctrl_select_state(pctldev->p,
2100 pctldev->hog_default))
2101 dev_err(pctldev->dev,
2102 "failed to select default state\n");
2105 pctldev->hog_sleep =
2106 pinctrl_lookup_state(pctldev->p,
2107 PINCTRL_STATE_SLEEP);
2108 if (IS_ERR(pctldev->hog_sleep))
2109 dev_dbg(pctldev->dev,
2110 "failed to lookup the sleep state\n");
2115 int pinctrl_enable(struct pinctrl_dev *pctldev)
2119 error = pinctrl_claim_hogs(pctldev);
2121 dev_err(pctldev->dev, "could not claim hogs: %i\n",
2123 pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
2124 pctldev->desc->npins);
2125 mutex_destroy(&pctldev->mutex);
2131 mutex_lock(&pinctrldev_list_mutex);
2132 list_add_tail(&pctldev->node, &pinctrldev_list);
2133 mutex_unlock(&pinctrldev_list_mutex);
2135 pinctrl_init_device_debugfs(pctldev);
2139 EXPORT_SYMBOL_GPL(pinctrl_enable);
2142 * pinctrl_register() - register a pin controller device
2143 * @pctldesc: descriptor for this pin controller
2144 * @dev: parent device for this pin controller
2145 * @driver_data: private pin controller data for this pin controller
2147 * Note that pinctrl_register() is known to have problems as the pin
2148 * controller driver functions are called before the driver has a
2149 * struct pinctrl_dev handle. To avoid issues later on, please use the
2150 * new pinctrl_register_and_init() below instead.
2152 struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
2153 struct device *dev, void *driver_data)
2155 struct pinctrl_dev *pctldev;
2158 pctldev = pinctrl_init_controller(pctldesc, dev, driver_data);
2159 if (IS_ERR(pctldev))
2162 error = pinctrl_enable(pctldev);
2164 return ERR_PTR(error);
2168 EXPORT_SYMBOL_GPL(pinctrl_register);
2171 * pinctrl_register_and_init() - register and init pin controller device
2172 * @pctldesc: descriptor for this pin controller
2173 * @dev: parent device for this pin controller
2174 * @driver_data: private pin controller data for this pin controller
2175 * @pctldev: pin controller device
2177 * Note that pinctrl_enable() still needs to be manually called after
2178 * this once the driver is ready.
2180 int pinctrl_register_and_init(struct pinctrl_desc *pctldesc,
2181 struct device *dev, void *driver_data,
2182 struct pinctrl_dev **pctldev)
2184 struct pinctrl_dev *p;
2186 p = pinctrl_init_controller(pctldesc, dev, driver_data);
2191 * We have pinctrl_start() call functions in the pin controller
2192 * driver with create_pinctrl() for at least dt_node_to_map(). So
2193 * let's make sure pctldev is properly initialized for the
2194 * pin controller driver before we do anything.
2200 EXPORT_SYMBOL_GPL(pinctrl_register_and_init);
2203 * pinctrl_unregister() - unregister pinmux
2204 * @pctldev: pin controller to unregister
2206 * Called by pinmux drivers to unregister a pinmux.
2208 void pinctrl_unregister(struct pinctrl_dev *pctldev)
2210 struct pinctrl_gpio_range *range, *n;
2215 mutex_lock(&pctldev->mutex);
2216 pinctrl_remove_device_debugfs(pctldev);
2217 mutex_unlock(&pctldev->mutex);
2219 if (!IS_ERR_OR_NULL(pctldev->p))
2220 pinctrl_put(pctldev->p);
2222 mutex_lock(&pinctrldev_list_mutex);
2223 mutex_lock(&pctldev->mutex);
2224 /* TODO: check that no pinmuxes are still active? */
2225 list_del(&pctldev->node);
2226 pinmux_generic_free_functions(pctldev);
2227 pinctrl_generic_free_groups(pctldev);
2228 /* Destroy descriptor tree */
2229 pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
2230 pctldev->desc->npins);
2231 /* remove gpio ranges map */
2232 list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node)
2233 list_del(&range->node);
2235 mutex_unlock(&pctldev->mutex);
2236 mutex_destroy(&pctldev->mutex);
2238 mutex_unlock(&pinctrldev_list_mutex);
2240 EXPORT_SYMBOL_GPL(pinctrl_unregister);
2242 static void devm_pinctrl_dev_release(struct device *dev, void *res)
2244 struct pinctrl_dev *pctldev = *(struct pinctrl_dev **)res;
2246 pinctrl_unregister(pctldev);
2249 static int devm_pinctrl_dev_match(struct device *dev, void *res, void *data)
2251 struct pctldev **r = res;
2253 if (WARN_ON(!r || !*r))
2260 * devm_pinctrl_register() - Resource managed version of pinctrl_register().
2261 * @dev: parent device for this pin controller
2262 * @pctldesc: descriptor for this pin controller
2263 * @driver_data: private pin controller data for this pin controller
2265 * Returns an error pointer if pincontrol register failed. Otherwise
2266 * it returns valid pinctrl handle.
2268 * The pinctrl device will be automatically released when the device is unbound.
2270 struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
2271 struct pinctrl_desc *pctldesc,
2274 struct pinctrl_dev **ptr, *pctldev;
2276 ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL);
2278 return ERR_PTR(-ENOMEM);
2280 pctldev = pinctrl_register(pctldesc, dev, driver_data);
2281 if (IS_ERR(pctldev)) {
2287 devres_add(dev, ptr);
2291 EXPORT_SYMBOL_GPL(devm_pinctrl_register);
2294 * devm_pinctrl_register_and_init() - Resource managed pinctrl register and init
2295 * @dev: parent device for this pin controller
2296 * @pctldesc: descriptor for this pin controller
2297 * @driver_data: private pin controller data for this pin controller
2298 * @pctldev: pin controller device
2300 * Returns zero on success or an error number on failure.
2302 * The pinctrl device will be automatically released when the device is unbound.
2304 int devm_pinctrl_register_and_init(struct device *dev,
2305 struct pinctrl_desc *pctldesc,
2307 struct pinctrl_dev **pctldev)
2309 struct pinctrl_dev **ptr;
2312 ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL);
2316 error = pinctrl_register_and_init(pctldesc, dev, driver_data, pctldev);
2323 devres_add(dev, ptr);
2327 EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init);
2330 * devm_pinctrl_unregister() - Resource managed version of pinctrl_unregister().
2331 * @dev: device for which resource was allocated
2332 * @pctldev: the pinctrl device to unregister.
2334 void devm_pinctrl_unregister(struct device *dev, struct pinctrl_dev *pctldev)
2336 WARN_ON(devres_release(dev, devm_pinctrl_dev_release,
2337 devm_pinctrl_dev_match, pctldev));
2339 EXPORT_SYMBOL_GPL(devm_pinctrl_unregister);
2341 static int __init pinctrl_init(void)
2343 pr_info("initialized pinctrl subsystem\n");
2344 pinctrl_init_debugfs();
2348 /* init early since many drivers really need to initialized pinmux early */
2349 core_initcall(pinctrl_init);