2 * Core driver for the pin control subsystem
4 * Copyright (C) 2011-2012 ST-Ericsson SA
5 * Written on behalf of Linaro for ST-Ericsson
6 * Based on bits of regulator core, gpio core and clk core
8 * Author: Linus Walleij <linus.walleij@linaro.org>
10 * Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
12 * License terms: GNU General Public License (GPL) version 2
14 #define pr_fmt(fmt) "pinctrl core: " fmt
16 #include <linux/kernel.h>
17 #include <linux/kref.h>
18 #include <linux/export.h>
19 #include <linux/init.h>
20 #include <linux/device.h>
21 #include <linux/slab.h>
22 #include <linux/err.h>
23 #include <linux/list.h>
24 #include <linux/sysfs.h>
25 #include <linux/debugfs.h>
26 #include <linux/seq_file.h>
27 #include <linux/pinctrl/consumer.h>
28 #include <linux/pinctrl/pinctrl.h>
29 #include <linux/pinctrl/machine.h>
32 #include <asm-generic/gpio.h>
36 #include "devicetree.h"
41 static bool pinctrl_dummy_state;
43 /* Mutex taken to protect pinctrl_list */
44 static DEFINE_MUTEX(pinctrl_list_mutex);
46 /* Mutex taken to protect pinctrl_maps */
47 DEFINE_MUTEX(pinctrl_maps_mutex);
49 /* Mutex taken to protect pinctrldev_list */
50 static DEFINE_MUTEX(pinctrldev_list_mutex);
52 /* Global list of pin control devices (struct pinctrl_dev) */
53 static LIST_HEAD(pinctrldev_list);
55 /* List of pin controller handles (struct pinctrl) */
56 static LIST_HEAD(pinctrl_list);
58 /* List of pinctrl maps (struct pinctrl_maps) */
59 LIST_HEAD(pinctrl_maps);
63 * pinctrl_provide_dummies() - indicate if pinctrl provides dummy state support
65 * Usually this function is called by platforms without pinctrl driver support
66 * but run with some shared drivers using pinctrl APIs.
67 * After calling this function, the pinctrl core will return successfully
68 * with creating a dummy state for the driver to keep going smoothly.
70 void pinctrl_provide_dummies(void)
72 pinctrl_dummy_state = true;
75 const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev)
77 /* We're not allowed to register devices without name */
78 return pctldev->desc->name;
80 EXPORT_SYMBOL_GPL(pinctrl_dev_get_name);
82 const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev)
84 return dev_name(pctldev->dev);
86 EXPORT_SYMBOL_GPL(pinctrl_dev_get_devname);
88 void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev)
90 return pctldev->driver_data;
92 EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata);
95 * get_pinctrl_dev_from_devname() - look up pin controller device
96 * @devname: the name of a device instance, as returned by dev_name()
98 * Looks up a pin control device matching a certain device name or pure device
99 * pointer, the pure device pointer will take precedence.
101 struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname)
103 struct pinctrl_dev *pctldev = NULL;
108 mutex_lock(&pinctrldev_list_mutex);
110 list_for_each_entry(pctldev, &pinctrldev_list, node) {
111 if (!strcmp(dev_name(pctldev->dev), devname)) {
112 /* Matched on device name */
113 mutex_unlock(&pinctrldev_list_mutex);
118 mutex_unlock(&pinctrldev_list_mutex);
123 struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np)
125 struct pinctrl_dev *pctldev;
127 mutex_lock(&pinctrldev_list_mutex);
129 list_for_each_entry(pctldev, &pinctrldev_list, node)
130 if (pctldev->dev->of_node == np) {
131 mutex_unlock(&pinctrldev_list_mutex);
135 mutex_unlock(&pinctrldev_list_mutex);
141 * pin_get_from_name() - look up a pin number from a name
142 * @pctldev: the pin control device to lookup the pin on
143 * @name: the name of the pin to look up
145 int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name)
149 /* The pin number can be retrived from the pin controller descriptor */
150 for (i = 0; i < pctldev->desc->npins; i++) {
151 struct pin_desc *desc;
153 pin = pctldev->desc->pins[i].number;
154 desc = pin_desc_get(pctldev, pin);
155 /* Pin space may be sparse */
156 if (desc && !strcmp(name, desc->name))
164 * pin_get_name_from_id() - look up a pin name from a pin id
165 * @pctldev: the pin control device to lookup the pin on
166 * @name: the name of the pin to look up
168 const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin)
170 const struct pin_desc *desc;
172 desc = pin_desc_get(pctldev, pin);
174 dev_err(pctldev->dev, "failed to get pin(%d) name\n",
183 * pin_is_valid() - check if pin exists on controller
184 * @pctldev: the pin control device to check the pin on
185 * @pin: pin to check, use the local pin controller index number
187 * This tells us whether a certain pin exist on a certain pin controller or
188 * not. Pin lists may be sparse, so some pins may not exist.
190 bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
192 struct pin_desc *pindesc;
197 mutex_lock(&pctldev->mutex);
198 pindesc = pin_desc_get(pctldev, pin);
199 mutex_unlock(&pctldev->mutex);
201 return pindesc != NULL;
203 EXPORT_SYMBOL_GPL(pin_is_valid);
205 /* Deletes a range of pin descriptors */
206 static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev,
207 const struct pinctrl_pin_desc *pins,
212 for (i = 0; i < num_pins; i++) {
213 struct pin_desc *pindesc;
215 pindesc = radix_tree_lookup(&pctldev->pin_desc_tree,
218 radix_tree_delete(&pctldev->pin_desc_tree,
220 if (pindesc->dynamic_name)
221 kfree(pindesc->name);
227 static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
228 const struct pinctrl_pin_desc *pin)
230 struct pin_desc *pindesc;
232 pindesc = pin_desc_get(pctldev, pin->number);
234 dev_err(pctldev->dev, "pin %d already registered\n",
239 pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL);
244 pindesc->pctldev = pctldev;
246 /* Copy basic pin info */
248 pindesc->name = pin->name;
250 pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", pin->number);
251 if (!pindesc->name) {
255 pindesc->dynamic_name = true;
258 pindesc->drv_data = pin->drv_data;
260 radix_tree_insert(&pctldev->pin_desc_tree, pin->number, pindesc);
261 pr_debug("registered pin %d (%s) on %s\n",
262 pin->number, pindesc->name, pctldev->desc->name);
266 static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
267 const struct pinctrl_pin_desc *pins,
273 for (i = 0; i < num_descs; i++) {
274 ret = pinctrl_register_one_pin(pctldev, &pins[i]);
283 * gpio_to_pin() - GPIO range GPIO number to pin number translation
284 * @range: GPIO range used for the translation
285 * @gpio: gpio pin to translate to a pin number
287 * Finds the pin number for a given GPIO using the specified GPIO range
288 * as a base for translation. The distinction between linear GPIO ranges
289 * and pin list based GPIO ranges is managed correctly by this function.
291 * This function assumes the gpio is part of the specified GPIO range, use
292 * only after making sure this is the case (e.g. by calling it on the
293 * result of successful pinctrl_get_device_gpio_range calls)!
295 static inline int gpio_to_pin(struct pinctrl_gpio_range *range,
298 unsigned int offset = gpio - range->base;
300 return range->pins[offset];
302 return range->pin_base + offset;
306 * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
307 * @pctldev: pin controller device to check
308 * @gpio: gpio pin to check taken from the global GPIO pin space
310 * Tries to match a GPIO pin number to the ranges handled by a certain pin
311 * controller, return the range or NULL
313 static struct pinctrl_gpio_range *
314 pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
316 struct pinctrl_gpio_range *range = NULL;
318 mutex_lock(&pctldev->mutex);
319 /* Loop over the ranges */
320 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
321 /* Check if we're in the valid range */
322 if (gpio >= range->base &&
323 gpio < range->base + range->npins) {
324 mutex_unlock(&pctldev->mutex);
328 mutex_unlock(&pctldev->mutex);
333 * pinctrl_ready_for_gpio_range() - check if other GPIO pins of
334 * the same GPIO chip are in range
335 * @gpio: gpio pin to check taken from the global GPIO pin space
337 * This function is complement of pinctrl_match_gpio_range(). If the return
338 * value of pinctrl_match_gpio_range() is NULL, this function could be used
339 * to check whether pinctrl device is ready or not. Maybe some GPIO pins
340 * of the same GPIO chip don't have back-end pinctrl interface.
341 * If the return value is true, it means that pinctrl device is ready & the
342 * certain GPIO pin doesn't have back-end pinctrl device. If the return value
343 * is false, it means that pinctrl device may not be ready.
345 #ifdef CONFIG_GPIOLIB
346 static bool pinctrl_ready_for_gpio_range(unsigned gpio)
348 struct pinctrl_dev *pctldev;
349 struct pinctrl_gpio_range *range = NULL;
350 struct gpio_chip *chip = gpio_to_chip(gpio);
352 if (WARN(!chip, "no gpio_chip for gpio%i?", gpio))
355 mutex_lock(&pinctrldev_list_mutex);
357 /* Loop over the pin controllers */
358 list_for_each_entry(pctldev, &pinctrldev_list, node) {
359 /* Loop over the ranges */
360 mutex_lock(&pctldev->mutex);
361 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
362 /* Check if any gpio range overlapped with gpio chip */
363 if (range->base + range->npins - 1 < chip->base ||
364 range->base > chip->base + chip->ngpio - 1)
366 mutex_unlock(&pctldev->mutex);
367 mutex_unlock(&pinctrldev_list_mutex);
370 mutex_unlock(&pctldev->mutex);
373 mutex_unlock(&pinctrldev_list_mutex);
378 static bool pinctrl_ready_for_gpio_range(unsigned gpio) { return true; }
382 * pinctrl_get_device_gpio_range() - find device for GPIO range
383 * @gpio: the pin to locate the pin controller for
384 * @outdev: the pin control device if found
385 * @outrange: the GPIO range if found
387 * Find the pin controller handling a certain GPIO pin from the pinspace of
388 * the GPIO subsystem, return the device and the matching GPIO range. Returns
389 * -EPROBE_DEFER if the GPIO range could not be found in any device since it
390 * may still have not been registered.
392 static int pinctrl_get_device_gpio_range(unsigned gpio,
393 struct pinctrl_dev **outdev,
394 struct pinctrl_gpio_range **outrange)
396 struct pinctrl_dev *pctldev = NULL;
398 mutex_lock(&pinctrldev_list_mutex);
400 /* Loop over the pin controllers */
401 list_for_each_entry(pctldev, &pinctrldev_list, node) {
402 struct pinctrl_gpio_range *range;
404 range = pinctrl_match_gpio_range(pctldev, gpio);
408 mutex_unlock(&pinctrldev_list_mutex);
413 mutex_unlock(&pinctrldev_list_mutex);
415 return -EPROBE_DEFER;
419 * pinctrl_add_gpio_range() - register a GPIO range for a controller
420 * @pctldev: pin controller device to add the range to
421 * @range: the GPIO range to add
423 * This adds a range of GPIOs to be handled by a certain pin controller. Call
424 * this to register handled ranges after registering your pin controller.
426 void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
427 struct pinctrl_gpio_range *range)
429 mutex_lock(&pctldev->mutex);
430 list_add_tail(&range->node, &pctldev->gpio_ranges);
431 mutex_unlock(&pctldev->mutex);
433 EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
435 void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
436 struct pinctrl_gpio_range *ranges,
441 for (i = 0; i < nranges; i++)
442 pinctrl_add_gpio_range(pctldev, &ranges[i]);
444 EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges);
446 struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
447 struct pinctrl_gpio_range *range)
449 struct pinctrl_dev *pctldev;
451 pctldev = get_pinctrl_dev_from_devname(devname);
454 * If we can't find this device, let's assume that is because
455 * it has not probed yet, so the driver trying to register this
456 * range need to defer probing.
459 return ERR_PTR(-EPROBE_DEFER);
461 pinctrl_add_gpio_range(pctldev, range);
465 EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range);
467 int pinctrl_get_group_pins(struct pinctrl_dev *pctldev, const char *pin_group,
468 const unsigned **pins, unsigned *num_pins)
470 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
473 if (!pctlops->get_group_pins)
476 gs = pinctrl_get_group_selector(pctldev, pin_group);
480 return pctlops->get_group_pins(pctldev, gs, pins, num_pins);
482 EXPORT_SYMBOL_GPL(pinctrl_get_group_pins);
484 struct pinctrl_gpio_range *
485 pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev,
488 struct pinctrl_gpio_range *range;
490 /* Loop over the ranges */
491 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
492 /* Check if we're in the valid range */
495 for (a = 0; a < range->npins; a++) {
496 if (range->pins[a] == pin)
499 } else if (pin >= range->pin_base &&
500 pin < range->pin_base + range->npins)
506 EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin_nolock);
509 * pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin
510 * @pctldev: the pin controller device to look in
511 * @pin: a controller-local number to find the range for
513 struct pinctrl_gpio_range *
514 pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
517 struct pinctrl_gpio_range *range;
519 mutex_lock(&pctldev->mutex);
520 range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin);
521 mutex_unlock(&pctldev->mutex);
525 EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin);
528 * pinctrl_remove_gpio_range() - remove a range of GPIOs from a pin controller
529 * @pctldev: pin controller device to remove the range from
530 * @range: the GPIO range to remove
532 void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
533 struct pinctrl_gpio_range *range)
535 mutex_lock(&pctldev->mutex);
536 list_del(&range->node);
537 mutex_unlock(&pctldev->mutex);
539 EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range);
541 #ifdef CONFIG_GENERIC_PINCTRL_GROUPS
544 * pinctrl_generic_get_group_count() - returns the number of pin groups
545 * @pctldev: pin controller device
547 int pinctrl_generic_get_group_count(struct pinctrl_dev *pctldev)
549 return pctldev->num_groups;
551 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_count);
554 * pinctrl_generic_get_group_name() - returns the name of a pin group
555 * @pctldev: pin controller device
556 * @selector: group number
558 const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev,
559 unsigned int selector)
561 struct group_desc *group;
563 group = radix_tree_lookup(&pctldev->pin_group_tree,
570 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_name);
573 * pinctrl_generic_get_group_pins() - gets the pin group pins
574 * @pctldev: pin controller device
575 * @selector: group number
576 * @pins: pins in the group
577 * @num_pins: number of pins in the group
579 int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev,
580 unsigned int selector,
581 const unsigned int **pins,
582 unsigned int *num_pins)
584 struct group_desc *group;
586 group = radix_tree_lookup(&pctldev->pin_group_tree,
589 dev_err(pctldev->dev, "%s could not find pingroup%i\n",
595 *num_pins = group->num_pins;
599 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_pins);
602 * pinctrl_generic_get_group() - returns a pin group based on the number
603 * @pctldev: pin controller device
604 * @gselector: group number
606 struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev,
607 unsigned int selector)
609 struct group_desc *group;
611 group = radix_tree_lookup(&pctldev->pin_group_tree,
618 EXPORT_SYMBOL_GPL(pinctrl_generic_get_group);
621 * pinctrl_generic_add_group() - adds a new pin group
622 * @pctldev: pin controller device
623 * @name: name of the pin group
624 * @pins: pins in the pin group
625 * @num_pins: number of pins in the pin group
626 * @data: pin controller driver specific data
628 * Note that the caller must take care of locking.
630 int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name,
631 int *pins, int num_pins, void *data)
633 struct group_desc *group;
635 group = devm_kzalloc(pctldev->dev, sizeof(*group), GFP_KERNEL);
641 group->num_pins = num_pins;
644 radix_tree_insert(&pctldev->pin_group_tree, pctldev->num_groups,
647 pctldev->num_groups++;
651 EXPORT_SYMBOL_GPL(pinctrl_generic_add_group);
654 * pinctrl_generic_remove_group() - removes a numbered pin group
655 * @pctldev: pin controller device
656 * @selector: group number
658 * Note that the caller must take care of locking.
660 int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev,
661 unsigned int selector)
663 struct group_desc *group;
665 group = radix_tree_lookup(&pctldev->pin_group_tree,
670 radix_tree_delete(&pctldev->pin_group_tree, selector);
671 devm_kfree(pctldev->dev, group);
673 pctldev->num_groups--;
677 EXPORT_SYMBOL_GPL(pinctrl_generic_remove_group);
680 * pinctrl_generic_free_groups() - removes all pin groups
681 * @pctldev: pin controller device
683 * Note that the caller must take care of locking. The pinctrl groups
684 * are allocated with devm_kzalloc() so no need to free them here.
686 static void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev)
688 struct radix_tree_iter iter;
691 radix_tree_for_each_slot(slot, &pctldev->pin_group_tree, &iter, 0)
692 radix_tree_delete(&pctldev->pin_group_tree, iter.index);
694 pctldev->num_groups = 0;
698 static inline void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev)
701 #endif /* CONFIG_GENERIC_PINCTRL_GROUPS */
704 * pinctrl_get_group_selector() - returns the group selector for a group
705 * @pctldev: the pin controller handling the group
706 * @pin_group: the pin group to look up
708 int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
709 const char *pin_group)
711 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
712 unsigned ngroups = pctlops->get_groups_count(pctldev);
713 unsigned group_selector = 0;
715 while (group_selector < ngroups) {
716 const char *gname = pctlops->get_group_name(pctldev,
718 if (!strcmp(gname, pin_group)) {
719 dev_dbg(pctldev->dev,
720 "found group selector %u for %s\n",
723 return group_selector;
729 dev_err(pctldev->dev, "does not have pin group %s\n",
736 * pinctrl_request_gpio() - request a single pin to be used as GPIO
737 * @gpio: the GPIO pin number from the GPIO subsystem number space
739 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
740 * as part of their gpio_request() semantics, platforms and individual drivers
741 * shall *NOT* request GPIO pins to be muxed in.
743 int pinctrl_request_gpio(unsigned gpio)
745 struct pinctrl_dev *pctldev;
746 struct pinctrl_gpio_range *range;
750 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
752 if (pinctrl_ready_for_gpio_range(gpio))
757 mutex_lock(&pctldev->mutex);
759 /* Convert to the pin controllers number space */
760 pin = gpio_to_pin(range, gpio);
762 ret = pinmux_request_gpio(pctldev, range, pin, gpio);
764 mutex_unlock(&pctldev->mutex);
768 EXPORT_SYMBOL_GPL(pinctrl_request_gpio);
771 * pinctrl_free_gpio() - free control on a single pin, currently used as GPIO
772 * @gpio: the GPIO pin number from the GPIO subsystem number space
774 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
775 * as part of their gpio_free() semantics, platforms and individual drivers
776 * shall *NOT* request GPIO pins to be muxed out.
778 void pinctrl_free_gpio(unsigned gpio)
780 struct pinctrl_dev *pctldev;
781 struct pinctrl_gpio_range *range;
785 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
789 mutex_lock(&pctldev->mutex);
791 /* Convert to the pin controllers number space */
792 pin = gpio_to_pin(range, gpio);
794 pinmux_free_gpio(pctldev, pin, range);
796 mutex_unlock(&pctldev->mutex);
798 EXPORT_SYMBOL_GPL(pinctrl_free_gpio);
800 static int pinctrl_gpio_direction(unsigned gpio, bool input)
802 struct pinctrl_dev *pctldev;
803 struct pinctrl_gpio_range *range;
807 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
812 mutex_lock(&pctldev->mutex);
814 /* Convert to the pin controllers number space */
815 pin = gpio_to_pin(range, gpio);
816 ret = pinmux_gpio_direction(pctldev, range, pin, input);
818 mutex_unlock(&pctldev->mutex);
824 * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode
825 * @gpio: the GPIO pin number from the GPIO subsystem number space
827 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
828 * as part of their gpio_direction_input() semantics, platforms and individual
829 * drivers shall *NOT* touch pin control GPIO calls.
831 int pinctrl_gpio_direction_input(unsigned gpio)
833 return pinctrl_gpio_direction(gpio, true);
835 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
838 * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode
839 * @gpio: the GPIO pin number from the GPIO subsystem number space
841 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
842 * as part of their gpio_direction_output() semantics, platforms and individual
843 * drivers shall *NOT* touch pin control GPIO calls.
845 int pinctrl_gpio_direction_output(unsigned gpio)
847 return pinctrl_gpio_direction(gpio, false);
849 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
852 * pinctrl_gpio_set_config() - Apply config to given GPIO pin
853 * @gpio: the GPIO pin number from the GPIO subsystem number space
854 * @config: the configuration to apply to the GPIO
856 * This function should *ONLY* be used from gpiolib-based GPIO drivers, if
857 * they need to call the underlying pin controller to change GPIO config
858 * (for example set debounce time).
860 int pinctrl_gpio_set_config(unsigned gpio, unsigned long config)
862 unsigned long configs[] = { config };
863 struct pinctrl_gpio_range *range;
864 struct pinctrl_dev *pctldev;
867 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
871 mutex_lock(&pctldev->mutex);
872 pin = gpio_to_pin(range, gpio);
873 ret = pinconf_set_config(pctldev, pin, configs, ARRAY_SIZE(configs));
874 mutex_unlock(&pctldev->mutex);
878 EXPORT_SYMBOL_GPL(pinctrl_gpio_set_config);
880 static struct pinctrl_state *find_state(struct pinctrl *p,
883 struct pinctrl_state *state;
885 list_for_each_entry(state, &p->states, node)
886 if (!strcmp(state->name, name))
892 static struct pinctrl_state *create_state(struct pinctrl *p,
895 struct pinctrl_state *state;
897 state = kzalloc(sizeof(*state), GFP_KERNEL);
899 return ERR_PTR(-ENOMEM);
902 INIT_LIST_HEAD(&state->settings);
904 list_add_tail(&state->node, &p->states);
909 static int add_setting(struct pinctrl *p, struct pinctrl_dev *pctldev,
910 const struct pinctrl_map *map)
912 struct pinctrl_state *state;
913 struct pinctrl_setting *setting;
916 state = find_state(p, map->name);
918 state = create_state(p, map->name);
920 return PTR_ERR(state);
922 if (map->type == PIN_MAP_TYPE_DUMMY_STATE)
925 setting = kzalloc(sizeof(*setting), GFP_KERNEL);
929 setting->type = map->type;
932 setting->pctldev = pctldev;
935 get_pinctrl_dev_from_devname(map->ctrl_dev_name);
936 if (!setting->pctldev) {
938 /* Do not defer probing of hogs (circular loop) */
939 if (!strcmp(map->ctrl_dev_name, map->dev_name))
942 * OK let us guess that the driver is not there yet, and
943 * let's defer obtaining this pinctrl handle to later...
945 dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe",
947 return -EPROBE_DEFER;
950 setting->dev_name = map->dev_name;
953 case PIN_MAP_TYPE_MUX_GROUP:
954 ret = pinmux_map_to_setting(map, setting);
956 case PIN_MAP_TYPE_CONFIGS_PIN:
957 case PIN_MAP_TYPE_CONFIGS_GROUP:
958 ret = pinconf_map_to_setting(map, setting);
969 list_add_tail(&setting->node, &state->settings);
974 static struct pinctrl *find_pinctrl(struct device *dev)
978 mutex_lock(&pinctrl_list_mutex);
979 list_for_each_entry(p, &pinctrl_list, node)
981 mutex_unlock(&pinctrl_list_mutex);
985 mutex_unlock(&pinctrl_list_mutex);
989 static void pinctrl_free(struct pinctrl *p, bool inlist);
991 static struct pinctrl *create_pinctrl(struct device *dev,
992 struct pinctrl_dev *pctldev)
996 struct pinctrl_maps *maps_node;
998 const struct pinctrl_map *map;
1002 * create the state cookie holder struct pinctrl for each
1003 * mapping, this is what consumers will get when requesting
1004 * a pin control handle with pinctrl_get()
1006 p = kzalloc(sizeof(*p), GFP_KERNEL);
1008 return ERR_PTR(-ENOMEM);
1010 INIT_LIST_HEAD(&p->states);
1011 INIT_LIST_HEAD(&p->dt_maps);
1013 ret = pinctrl_dt_to_map(p, pctldev);
1016 return ERR_PTR(ret);
1019 devname = dev_name(dev);
1021 mutex_lock(&pinctrl_maps_mutex);
1022 /* Iterate over the pin control maps to locate the right ones */
1023 for_each_maps(maps_node, i, map) {
1024 /* Map must be for this device */
1025 if (strcmp(map->dev_name, devname))
1028 * If pctldev is not null, we are claiming hog for it,
1029 * that means, setting that is served by pctldev by itself.
1031 * Thus we must skip map that is for this device but is served
1035 strcmp(dev_name(pctldev->dev), map->ctrl_dev_name))
1038 ret = add_setting(p, pctldev, map);
1040 * At this point the adding of a setting may:
1042 * - Defer, if the pinctrl device is not yet available
1043 * - Fail, if the pinctrl device is not yet available,
1044 * AND the setting is a hog. We cannot defer that, since
1045 * the hog will kick in immediately after the device
1048 * If the error returned was not -EPROBE_DEFER then we
1049 * accumulate the errors to see if we end up with
1050 * an -EPROBE_DEFER later, as that is the worst case.
1052 if (ret == -EPROBE_DEFER) {
1053 pinctrl_free(p, false);
1054 mutex_unlock(&pinctrl_maps_mutex);
1055 return ERR_PTR(ret);
1058 mutex_unlock(&pinctrl_maps_mutex);
1061 /* If some other error than deferral occurred, return here */
1062 pinctrl_free(p, false);
1063 return ERR_PTR(ret);
1066 kref_init(&p->users);
1068 /* Add the pinctrl handle to the global list */
1069 mutex_lock(&pinctrl_list_mutex);
1070 list_add_tail(&p->node, &pinctrl_list);
1071 mutex_unlock(&pinctrl_list_mutex);
1077 * pinctrl_get() - retrieves the pinctrl handle for a device
1078 * @dev: the device to obtain the handle for
1080 struct pinctrl *pinctrl_get(struct device *dev)
1085 return ERR_PTR(-EINVAL);
1088 * See if somebody else (such as the device core) has already
1089 * obtained a handle to the pinctrl for this device. In that case,
1090 * return another pointer to it.
1092 p = find_pinctrl(dev);
1094 dev_dbg(dev, "obtain a copy of previously claimed pinctrl\n");
1095 kref_get(&p->users);
1099 return create_pinctrl(dev, NULL);
1101 EXPORT_SYMBOL_GPL(pinctrl_get);
1103 static void pinctrl_free_setting(bool disable_setting,
1104 struct pinctrl_setting *setting)
1106 switch (setting->type) {
1107 case PIN_MAP_TYPE_MUX_GROUP:
1108 if (disable_setting)
1109 pinmux_disable_setting(setting);
1110 pinmux_free_setting(setting);
1112 case PIN_MAP_TYPE_CONFIGS_PIN:
1113 case PIN_MAP_TYPE_CONFIGS_GROUP:
1114 pinconf_free_setting(setting);
1121 static void pinctrl_free(struct pinctrl *p, bool inlist)
1123 struct pinctrl_state *state, *n1;
1124 struct pinctrl_setting *setting, *n2;
1126 mutex_lock(&pinctrl_list_mutex);
1127 list_for_each_entry_safe(state, n1, &p->states, node) {
1128 list_for_each_entry_safe(setting, n2, &state->settings, node) {
1129 pinctrl_free_setting(state == p->state, setting);
1130 list_del(&setting->node);
1133 list_del(&state->node);
1137 pinctrl_dt_free_maps(p);
1142 mutex_unlock(&pinctrl_list_mutex);
1146 * pinctrl_release() - release the pinctrl handle
1147 * @kref: the kref in the pinctrl being released
1149 static void pinctrl_release(struct kref *kref)
1151 struct pinctrl *p = container_of(kref, struct pinctrl, users);
1153 pinctrl_free(p, true);
1157 * pinctrl_put() - decrease use count on a previously claimed pinctrl handle
1158 * @p: the pinctrl handle to release
1160 void pinctrl_put(struct pinctrl *p)
1162 kref_put(&p->users, pinctrl_release);
1164 EXPORT_SYMBOL_GPL(pinctrl_put);
1167 * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle
1168 * @p: the pinctrl handle to retrieve the state from
1169 * @name: the state name to retrieve
1171 struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p,
1174 struct pinctrl_state *state;
1176 state = find_state(p, name);
1178 if (pinctrl_dummy_state) {
1179 /* create dummy state */
1180 dev_dbg(p->dev, "using pinctrl dummy state (%s)\n",
1182 state = create_state(p, name);
1184 state = ERR_PTR(-ENODEV);
1189 EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
1192 * pinctrl_select_state() - select/activate/program a pinctrl state to HW
1193 * @p: the pinctrl handle for the device that requests configuration
1194 * @state: the state handle to select/activate/program
1196 int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
1198 struct pinctrl_setting *setting, *setting2;
1199 struct pinctrl_state *old_state = p->state;
1202 if (p->state == state)
1207 * For each pinmux setting in the old state, forget SW's record
1208 * of mux owner for that pingroup. Any pingroups which are
1209 * still owned by the new state will be re-acquired by the call
1210 * to pinmux_enable_setting() in the loop below.
1212 list_for_each_entry(setting, &p->state->settings, node) {
1213 if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
1215 pinmux_disable_setting(setting);
1221 /* Apply all the settings for the new state */
1222 list_for_each_entry(setting, &state->settings, node) {
1223 switch (setting->type) {
1224 case PIN_MAP_TYPE_MUX_GROUP:
1225 ret = pinmux_enable_setting(setting);
1227 case PIN_MAP_TYPE_CONFIGS_PIN:
1228 case PIN_MAP_TYPE_CONFIGS_GROUP:
1229 ret = pinconf_apply_setting(setting);
1237 goto unapply_new_state;
1246 dev_err(p->dev, "Error applying setting, reverse things back\n");
1248 list_for_each_entry(setting2, &state->settings, node) {
1249 if (&setting2->node == &setting->node)
1252 * All we can do here is pinmux_disable_setting.
1253 * That means that some pins are muxed differently now
1254 * than they were before applying the setting (We can't
1255 * "unmux a pin"!), but it's not a big deal since the pins
1256 * are free to be muxed by another apply_setting.
1258 if (setting2->type == PIN_MAP_TYPE_MUX_GROUP)
1259 pinmux_disable_setting(setting2);
1262 /* There's no infinite recursive loop here because p->state is NULL */
1264 pinctrl_select_state(p, old_state);
1268 EXPORT_SYMBOL_GPL(pinctrl_select_state);
1270 static void devm_pinctrl_release(struct device *dev, void *res)
1272 pinctrl_put(*(struct pinctrl **)res);
1276 * struct devm_pinctrl_get() - Resource managed pinctrl_get()
1277 * @dev: the device to obtain the handle for
1279 * If there is a need to explicitly destroy the returned struct pinctrl,
1280 * devm_pinctrl_put() should be used, rather than plain pinctrl_put().
1282 struct pinctrl *devm_pinctrl_get(struct device *dev)
1284 struct pinctrl **ptr, *p;
1286 ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL);
1288 return ERR_PTR(-ENOMEM);
1290 p = pinctrl_get(dev);
1293 devres_add(dev, ptr);
1300 EXPORT_SYMBOL_GPL(devm_pinctrl_get);
1302 static int devm_pinctrl_match(struct device *dev, void *res, void *data)
1304 struct pinctrl **p = res;
1310 * devm_pinctrl_put() - Resource managed pinctrl_put()
1311 * @p: the pinctrl handle to release
1313 * Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally
1314 * this function will not need to be called and the resource management
1315 * code will ensure that the resource is freed.
1317 void devm_pinctrl_put(struct pinctrl *p)
1319 WARN_ON(devres_release(p->dev, devm_pinctrl_release,
1320 devm_pinctrl_match, p));
1322 EXPORT_SYMBOL_GPL(devm_pinctrl_put);
1324 int pinctrl_register_map(const struct pinctrl_map *maps, unsigned num_maps,
1328 struct pinctrl_maps *maps_node;
1330 pr_debug("add %u pinctrl maps\n", num_maps);
1332 /* First sanity check the new mapping */
1333 for (i = 0; i < num_maps; i++) {
1334 if (!maps[i].dev_name) {
1335 pr_err("failed to register map %s (%d): no device given\n",
1340 if (!maps[i].name) {
1341 pr_err("failed to register map %d: no map name given\n",
1346 if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE &&
1347 !maps[i].ctrl_dev_name) {
1348 pr_err("failed to register map %s (%d): no pin control device given\n",
1353 switch (maps[i].type) {
1354 case PIN_MAP_TYPE_DUMMY_STATE:
1356 case PIN_MAP_TYPE_MUX_GROUP:
1357 ret = pinmux_validate_map(&maps[i], i);
1361 case PIN_MAP_TYPE_CONFIGS_PIN:
1362 case PIN_MAP_TYPE_CONFIGS_GROUP:
1363 ret = pinconf_validate_map(&maps[i], i);
1368 pr_err("failed to register map %s (%d): invalid type given\n",
1374 maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL);
1378 maps_node->num_maps = num_maps;
1380 maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps,
1382 if (!maps_node->maps) {
1383 pr_err("failed to duplicate mapping table\n");
1388 maps_node->maps = maps;
1391 mutex_lock(&pinctrl_maps_mutex);
1392 list_add_tail(&maps_node->node, &pinctrl_maps);
1393 mutex_unlock(&pinctrl_maps_mutex);
1399 * pinctrl_register_mappings() - register a set of pin controller mappings
1400 * @maps: the pincontrol mappings table to register. This should probably be
1401 * marked with __initdata so it can be discarded after boot. This
1402 * function will perform a shallow copy for the mapping entries.
1403 * @num_maps: the number of maps in the mapping table
1405 int pinctrl_register_mappings(const struct pinctrl_map *maps,
1408 return pinctrl_register_map(maps, num_maps, true);
1411 void pinctrl_unregister_map(const struct pinctrl_map *map)
1413 struct pinctrl_maps *maps_node;
1415 mutex_lock(&pinctrl_maps_mutex);
1416 list_for_each_entry(maps_node, &pinctrl_maps, node) {
1417 if (maps_node->maps == map) {
1418 list_del(&maps_node->node);
1420 mutex_unlock(&pinctrl_maps_mutex);
1424 mutex_unlock(&pinctrl_maps_mutex);
1428 * pinctrl_force_sleep() - turn a given controller device into sleep state
1429 * @pctldev: pin controller device
1431 int pinctrl_force_sleep(struct pinctrl_dev *pctldev)
1433 if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_sleep))
1434 return pinctrl_select_state(pctldev->p, pctldev->hog_sleep);
1437 EXPORT_SYMBOL_GPL(pinctrl_force_sleep);
1440 * pinctrl_force_default() - turn a given controller device into default state
1441 * @pctldev: pin controller device
1443 int pinctrl_force_default(struct pinctrl_dev *pctldev)
1445 if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_default))
1446 return pinctrl_select_state(pctldev->p, pctldev->hog_default);
1449 EXPORT_SYMBOL_GPL(pinctrl_force_default);
1452 * pinctrl_init_done() - tell pinctrl probe is done
1454 * We'll use this time to switch the pins from "init" to "default" unless the
1455 * driver selected some other state.
1457 * @dev: device to that's done probing
1459 int pinctrl_init_done(struct device *dev)
1461 struct dev_pin_info *pins = dev->pins;
1467 if (IS_ERR(pins->init_state))
1468 return 0; /* No such state */
1470 if (pins->p->state != pins->init_state)
1471 return 0; /* Not at init anyway */
1473 if (IS_ERR(pins->default_state))
1474 return 0; /* No default state */
1476 ret = pinctrl_select_state(pins->p, pins->default_state);
1478 dev_err(dev, "failed to activate default pinctrl state\n");
1486 * pinctrl_pm_select_state() - select pinctrl state for PM
1487 * @dev: device to select default state for
1488 * @state: state to set
1490 static int pinctrl_pm_select_state(struct device *dev,
1491 struct pinctrl_state *state)
1493 struct dev_pin_info *pins = dev->pins;
1497 return 0; /* No such state */
1498 ret = pinctrl_select_state(pins->p, state);
1500 dev_err(dev, "failed to activate pinctrl state %s\n",
1506 * pinctrl_pm_select_default_state() - select default pinctrl state for PM
1507 * @dev: device to select default state for
1509 int pinctrl_pm_select_default_state(struct device *dev)
1514 return pinctrl_pm_select_state(dev, dev->pins->default_state);
1516 EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state);
1519 * pinctrl_pm_select_sleep_state() - select sleep pinctrl state for PM
1520 * @dev: device to select sleep state for
1522 int pinctrl_pm_select_sleep_state(struct device *dev)
1527 return pinctrl_pm_select_state(dev, dev->pins->sleep_state);
1529 EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state);
1532 * pinctrl_pm_select_idle_state() - select idle pinctrl state for PM
1533 * @dev: device to select idle state for
1535 int pinctrl_pm_select_idle_state(struct device *dev)
1540 return pinctrl_pm_select_state(dev, dev->pins->idle_state);
1542 EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state);
1545 #ifdef CONFIG_DEBUG_FS
1547 static int pinctrl_pins_show(struct seq_file *s, void *what)
1549 struct pinctrl_dev *pctldev = s->private;
1550 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1553 seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
1555 mutex_lock(&pctldev->mutex);
1557 /* The pin number can be retrived from the pin controller descriptor */
1558 for (i = 0; i < pctldev->desc->npins; i++) {
1559 struct pin_desc *desc;
1561 pin = pctldev->desc->pins[i].number;
1562 desc = pin_desc_get(pctldev, pin);
1563 /* Pin space may be sparse */
1567 seq_printf(s, "pin %d (%s) ", pin, desc->name);
1569 /* Driver-specific info per pin */
1570 if (ops->pin_dbg_show)
1571 ops->pin_dbg_show(pctldev, s, pin);
1576 mutex_unlock(&pctldev->mutex);
1581 static int pinctrl_groups_show(struct seq_file *s, void *what)
1583 struct pinctrl_dev *pctldev = s->private;
1584 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1585 unsigned ngroups, selector = 0;
1587 mutex_lock(&pctldev->mutex);
1589 ngroups = ops->get_groups_count(pctldev);
1591 seq_puts(s, "registered pin groups:\n");
1592 while (selector < ngroups) {
1593 const unsigned *pins = NULL;
1594 unsigned num_pins = 0;
1595 const char *gname = ops->get_group_name(pctldev, selector);
1600 if (ops->get_group_pins)
1601 ret = ops->get_group_pins(pctldev, selector,
1604 seq_printf(s, "%s [ERROR GETTING PINS]\n",
1607 seq_printf(s, "group: %s\n", gname);
1608 for (i = 0; i < num_pins; i++) {
1609 pname = pin_get_name(pctldev, pins[i]);
1610 if (WARN_ON(!pname)) {
1611 mutex_unlock(&pctldev->mutex);
1614 seq_printf(s, "pin %d (%s)\n", pins[i], pname);
1621 mutex_unlock(&pctldev->mutex);
1626 static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
1628 struct pinctrl_dev *pctldev = s->private;
1629 struct pinctrl_gpio_range *range = NULL;
1631 seq_puts(s, "GPIO ranges handled:\n");
1633 mutex_lock(&pctldev->mutex);
1635 /* Loop over the ranges */
1636 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
1639 seq_printf(s, "%u: %s GPIOS [%u - %u] PINS {",
1640 range->id, range->name,
1641 range->base, (range->base + range->npins - 1));
1642 for (a = 0; a < range->npins - 1; a++)
1643 seq_printf(s, "%u, ", range->pins[a]);
1644 seq_printf(s, "%u}\n", range->pins[a]);
1647 seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
1648 range->id, range->name,
1649 range->base, (range->base + range->npins - 1),
1651 (range->pin_base + range->npins - 1));
1654 mutex_unlock(&pctldev->mutex);
1659 static int pinctrl_devices_show(struct seq_file *s, void *what)
1661 struct pinctrl_dev *pctldev;
1663 seq_puts(s, "name [pinmux] [pinconf]\n");
1665 mutex_lock(&pinctrldev_list_mutex);
1667 list_for_each_entry(pctldev, &pinctrldev_list, node) {
1668 seq_printf(s, "%s ", pctldev->desc->name);
1669 if (pctldev->desc->pmxops)
1670 seq_puts(s, "yes ");
1673 if (pctldev->desc->confops)
1680 mutex_unlock(&pinctrldev_list_mutex);
1685 static inline const char *map_type(enum pinctrl_map_type type)
1687 static const char * const names[] = {
1695 if (type >= ARRAY_SIZE(names))
1701 static int pinctrl_maps_show(struct seq_file *s, void *what)
1703 struct pinctrl_maps *maps_node;
1705 const struct pinctrl_map *map;
1707 seq_puts(s, "Pinctrl maps:\n");
1709 mutex_lock(&pinctrl_maps_mutex);
1710 for_each_maps(maps_node, i, map) {
1711 seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n",
1712 map->dev_name, map->name, map_type(map->type),
1715 if (map->type != PIN_MAP_TYPE_DUMMY_STATE)
1716 seq_printf(s, "controlling device %s\n",
1717 map->ctrl_dev_name);
1719 switch (map->type) {
1720 case PIN_MAP_TYPE_MUX_GROUP:
1721 pinmux_show_map(s, map);
1723 case PIN_MAP_TYPE_CONFIGS_PIN:
1724 case PIN_MAP_TYPE_CONFIGS_GROUP:
1725 pinconf_show_map(s, map);
1733 mutex_unlock(&pinctrl_maps_mutex);
1738 static int pinctrl_show(struct seq_file *s, void *what)
1741 struct pinctrl_state *state;
1742 struct pinctrl_setting *setting;
1744 seq_puts(s, "Requested pin control handlers their pinmux maps:\n");
1746 mutex_lock(&pinctrl_list_mutex);
1748 list_for_each_entry(p, &pinctrl_list, node) {
1749 seq_printf(s, "device: %s current state: %s\n",
1751 p->state ? p->state->name : "none");
1753 list_for_each_entry(state, &p->states, node) {
1754 seq_printf(s, " state: %s\n", state->name);
1756 list_for_each_entry(setting, &state->settings, node) {
1757 struct pinctrl_dev *pctldev = setting->pctldev;
1759 seq_printf(s, " type: %s controller %s ",
1760 map_type(setting->type),
1761 pinctrl_dev_get_name(pctldev));
1763 switch (setting->type) {
1764 case PIN_MAP_TYPE_MUX_GROUP:
1765 pinmux_show_setting(s, setting);
1767 case PIN_MAP_TYPE_CONFIGS_PIN:
1768 case PIN_MAP_TYPE_CONFIGS_GROUP:
1769 pinconf_show_setting(s, setting);
1778 mutex_unlock(&pinctrl_list_mutex);
1783 static int pinctrl_pins_open(struct inode *inode, struct file *file)
1785 return single_open(file, pinctrl_pins_show, inode->i_private);
1788 static int pinctrl_groups_open(struct inode *inode, struct file *file)
1790 return single_open(file, pinctrl_groups_show, inode->i_private);
1793 static int pinctrl_gpioranges_open(struct inode *inode, struct file *file)
1795 return single_open(file, pinctrl_gpioranges_show, inode->i_private);
1798 static int pinctrl_devices_open(struct inode *inode, struct file *file)
1800 return single_open(file, pinctrl_devices_show, NULL);
1803 static int pinctrl_maps_open(struct inode *inode, struct file *file)
1805 return single_open(file, pinctrl_maps_show, NULL);
1808 static int pinctrl_open(struct inode *inode, struct file *file)
1810 return single_open(file, pinctrl_show, NULL);
1813 static const struct file_operations pinctrl_pins_ops = {
1814 .open = pinctrl_pins_open,
1816 .llseek = seq_lseek,
1817 .release = single_release,
1820 static const struct file_operations pinctrl_groups_ops = {
1821 .open = pinctrl_groups_open,
1823 .llseek = seq_lseek,
1824 .release = single_release,
1827 static const struct file_operations pinctrl_gpioranges_ops = {
1828 .open = pinctrl_gpioranges_open,
1830 .llseek = seq_lseek,
1831 .release = single_release,
1834 static const struct file_operations pinctrl_devices_ops = {
1835 .open = pinctrl_devices_open,
1837 .llseek = seq_lseek,
1838 .release = single_release,
1841 static const struct file_operations pinctrl_maps_ops = {
1842 .open = pinctrl_maps_open,
1844 .llseek = seq_lseek,
1845 .release = single_release,
1848 static const struct file_operations pinctrl_ops = {
1849 .open = pinctrl_open,
1851 .llseek = seq_lseek,
1852 .release = single_release,
1855 static struct dentry *debugfs_root;
1857 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1859 struct dentry *device_root;
1861 device_root = debugfs_create_dir(dev_name(pctldev->dev),
1863 pctldev->device_root = device_root;
1865 if (IS_ERR(device_root) || !device_root) {
1866 pr_warn("failed to create debugfs directory for %s\n",
1867 dev_name(pctldev->dev));
1870 debugfs_create_file("pins", S_IFREG | S_IRUGO,
1871 device_root, pctldev, &pinctrl_pins_ops);
1872 debugfs_create_file("pingroups", S_IFREG | S_IRUGO,
1873 device_root, pctldev, &pinctrl_groups_ops);
1874 debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO,
1875 device_root, pctldev, &pinctrl_gpioranges_ops);
1876 if (pctldev->desc->pmxops)
1877 pinmux_init_device_debugfs(device_root, pctldev);
1878 if (pctldev->desc->confops)
1879 pinconf_init_device_debugfs(device_root, pctldev);
1882 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1884 debugfs_remove_recursive(pctldev->device_root);
1887 static void pinctrl_init_debugfs(void)
1889 debugfs_root = debugfs_create_dir("pinctrl", NULL);
1890 if (IS_ERR(debugfs_root) || !debugfs_root) {
1891 pr_warn("failed to create debugfs directory\n");
1892 debugfs_root = NULL;
1896 debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO,
1897 debugfs_root, NULL, &pinctrl_devices_ops);
1898 debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO,
1899 debugfs_root, NULL, &pinctrl_maps_ops);
1900 debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO,
1901 debugfs_root, NULL, &pinctrl_ops);
1904 #else /* CONFIG_DEBUG_FS */
1906 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1910 static void pinctrl_init_debugfs(void)
1914 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1920 static int pinctrl_check_ops(struct pinctrl_dev *pctldev)
1922 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1925 !ops->get_groups_count ||
1926 !ops->get_group_name)
1933 * pinctrl_init_controller() - init a pin controller device
1934 * @pctldesc: descriptor for this pin controller
1935 * @dev: parent device for this pin controller
1936 * @driver_data: private pin controller data for this pin controller
1938 static struct pinctrl_dev *
1939 pinctrl_init_controller(struct pinctrl_desc *pctldesc, struct device *dev,
1942 struct pinctrl_dev *pctldev;
1946 return ERR_PTR(-EINVAL);
1947 if (!pctldesc->name)
1948 return ERR_PTR(-EINVAL);
1950 pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL);
1952 return ERR_PTR(-ENOMEM);
1954 /* Initialize pin control device struct */
1955 pctldev->owner = pctldesc->owner;
1956 pctldev->desc = pctldesc;
1957 pctldev->driver_data = driver_data;
1958 INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
1959 #ifdef CONFIG_GENERIC_PINCTRL_GROUPS
1960 INIT_RADIX_TREE(&pctldev->pin_group_tree, GFP_KERNEL);
1962 #ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS
1963 INIT_RADIX_TREE(&pctldev->pin_function_tree, GFP_KERNEL);
1965 INIT_LIST_HEAD(&pctldev->gpio_ranges);
1966 INIT_LIST_HEAD(&pctldev->node);
1968 mutex_init(&pctldev->mutex);
1970 /* check core ops for sanity */
1971 ret = pinctrl_check_ops(pctldev);
1973 dev_err(dev, "pinctrl ops lacks necessary functions\n");
1977 /* If we're implementing pinmuxing, check the ops for sanity */
1978 if (pctldesc->pmxops) {
1979 ret = pinmux_check_ops(pctldev);
1984 /* If we're implementing pinconfig, check the ops for sanity */
1985 if (pctldesc->confops) {
1986 ret = pinconf_check_ops(pctldev);
1991 /* Register all the pins */
1992 dev_dbg(dev, "try to register %d pins ...\n", pctldesc->npins);
1993 ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins);
1995 dev_err(dev, "error during pin registration\n");
1996 pinctrl_free_pindescs(pctldev, pctldesc->pins,
2004 mutex_destroy(&pctldev->mutex);
2006 return ERR_PTR(ret);
2009 static int pinctrl_claim_hogs(struct pinctrl_dev *pctldev)
2011 pctldev->p = create_pinctrl(pctldev->dev, pctldev);
2012 if (PTR_ERR(pctldev->p) == -ENODEV) {
2013 dev_dbg(pctldev->dev, "no hogs found\n");
2018 if (IS_ERR(pctldev->p)) {
2019 dev_err(pctldev->dev, "error claiming hogs: %li\n",
2020 PTR_ERR(pctldev->p));
2022 return PTR_ERR(pctldev->p);
2025 kref_get(&pctldev->p->users);
2026 pctldev->hog_default =
2027 pinctrl_lookup_state(pctldev->p, PINCTRL_STATE_DEFAULT);
2028 if (IS_ERR(pctldev->hog_default)) {
2029 dev_dbg(pctldev->dev,
2030 "failed to lookup the default state\n");
2032 if (pinctrl_select_state(pctldev->p,
2033 pctldev->hog_default))
2034 dev_err(pctldev->dev,
2035 "failed to select default state\n");
2038 pctldev->hog_sleep =
2039 pinctrl_lookup_state(pctldev->p,
2040 PINCTRL_STATE_SLEEP);
2041 if (IS_ERR(pctldev->hog_sleep))
2042 dev_dbg(pctldev->dev,
2043 "failed to lookup the sleep state\n");
2048 int pinctrl_enable(struct pinctrl_dev *pctldev)
2052 error = pinctrl_claim_hogs(pctldev);
2054 dev_err(pctldev->dev, "could not claim hogs: %i\n",
2056 mutex_destroy(&pctldev->mutex);
2062 mutex_lock(&pinctrldev_list_mutex);
2063 list_add_tail(&pctldev->node, &pinctrldev_list);
2064 mutex_unlock(&pinctrldev_list_mutex);
2066 pinctrl_init_device_debugfs(pctldev);
2070 EXPORT_SYMBOL_GPL(pinctrl_enable);
2073 * pinctrl_register() - register a pin controller device
2074 * @pctldesc: descriptor for this pin controller
2075 * @dev: parent device for this pin controller
2076 * @driver_data: private pin controller data for this pin controller
2078 * Note that pinctrl_register() is known to have problems as the pin
2079 * controller driver functions are called before the driver has a
2080 * struct pinctrl_dev handle. To avoid issues later on, please use the
2081 * new pinctrl_register_and_init() below instead.
2083 struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
2084 struct device *dev, void *driver_data)
2086 struct pinctrl_dev *pctldev;
2089 pctldev = pinctrl_init_controller(pctldesc, dev, driver_data);
2090 if (IS_ERR(pctldev))
2093 error = pinctrl_enable(pctldev);
2095 return ERR_PTR(error);
2100 EXPORT_SYMBOL_GPL(pinctrl_register);
2103 * pinctrl_register_and_init() - register and init pin controller device
2104 * @pctldesc: descriptor for this pin controller
2105 * @dev: parent device for this pin controller
2106 * @driver_data: private pin controller data for this pin controller
2107 * @pctldev: pin controller device
2109 * Note that pinctrl_enable() still needs to be manually called after
2110 * this once the driver is ready.
2112 int pinctrl_register_and_init(struct pinctrl_desc *pctldesc,
2113 struct device *dev, void *driver_data,
2114 struct pinctrl_dev **pctldev)
2116 struct pinctrl_dev *p;
2118 p = pinctrl_init_controller(pctldesc, dev, driver_data);
2123 * We have pinctrl_start() call functions in the pin controller
2124 * driver with create_pinctrl() for at least dt_node_to_map(). So
2125 * let's make sure pctldev is properly initialized for the
2126 * pin controller driver before we do anything.
2132 EXPORT_SYMBOL_GPL(pinctrl_register_and_init);
2135 * pinctrl_unregister() - unregister pinmux
2136 * @pctldev: pin controller to unregister
2138 * Called by pinmux drivers to unregister a pinmux.
2140 void pinctrl_unregister(struct pinctrl_dev *pctldev)
2142 struct pinctrl_gpio_range *range, *n;
2147 mutex_lock(&pctldev->mutex);
2148 pinctrl_remove_device_debugfs(pctldev);
2149 mutex_unlock(&pctldev->mutex);
2151 if (!IS_ERR_OR_NULL(pctldev->p))
2152 pinctrl_put(pctldev->p);
2154 mutex_lock(&pinctrldev_list_mutex);
2155 mutex_lock(&pctldev->mutex);
2156 /* TODO: check that no pinmuxes are still active? */
2157 list_del(&pctldev->node);
2158 pinmux_generic_free_functions(pctldev);
2159 pinctrl_generic_free_groups(pctldev);
2160 /* Destroy descriptor tree */
2161 pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
2162 pctldev->desc->npins);
2163 /* remove gpio ranges map */
2164 list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node)
2165 list_del(&range->node);
2167 mutex_unlock(&pctldev->mutex);
2168 mutex_destroy(&pctldev->mutex);
2170 mutex_unlock(&pinctrldev_list_mutex);
2172 EXPORT_SYMBOL_GPL(pinctrl_unregister);
2174 static void devm_pinctrl_dev_release(struct device *dev, void *res)
2176 struct pinctrl_dev *pctldev = *(struct pinctrl_dev **)res;
2178 pinctrl_unregister(pctldev);
2181 static int devm_pinctrl_dev_match(struct device *dev, void *res, void *data)
2183 struct pctldev **r = res;
2185 if (WARN_ON(!r || !*r))
2192 * devm_pinctrl_register() - Resource managed version of pinctrl_register().
2193 * @dev: parent device for this pin controller
2194 * @pctldesc: descriptor for this pin controller
2195 * @driver_data: private pin controller data for this pin controller
2197 * Returns an error pointer if pincontrol register failed. Otherwise
2198 * it returns valid pinctrl handle.
2200 * The pinctrl device will be automatically released when the device is unbound.
2202 struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
2203 struct pinctrl_desc *pctldesc,
2206 struct pinctrl_dev **ptr, *pctldev;
2208 ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL);
2210 return ERR_PTR(-ENOMEM);
2212 pctldev = pinctrl_register(pctldesc, dev, driver_data);
2213 if (IS_ERR(pctldev)) {
2219 devres_add(dev, ptr);
2223 EXPORT_SYMBOL_GPL(devm_pinctrl_register);
2226 * devm_pinctrl_register_and_init() - Resource managed pinctrl register and init
2227 * @dev: parent device for this pin controller
2228 * @pctldesc: descriptor for this pin controller
2229 * @driver_data: private pin controller data for this pin controller
2231 * Returns an error pointer if pincontrol register failed. Otherwise
2232 * it returns valid pinctrl handle.
2234 * The pinctrl device will be automatically released when the device is unbound.
2236 int devm_pinctrl_register_and_init(struct device *dev,
2237 struct pinctrl_desc *pctldesc,
2239 struct pinctrl_dev **pctldev)
2241 struct pinctrl_dev **ptr;
2244 ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL);
2248 error = pinctrl_register_and_init(pctldesc, dev, driver_data, pctldev);
2255 devres_add(dev, ptr);
2259 EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init);
2262 * devm_pinctrl_unregister() - Resource managed version of pinctrl_unregister().
2263 * @dev: device for which which resource was allocated
2264 * @pctldev: the pinctrl device to unregister.
2266 void devm_pinctrl_unregister(struct device *dev, struct pinctrl_dev *pctldev)
2268 WARN_ON(devres_release(dev, devm_pinctrl_dev_release,
2269 devm_pinctrl_dev_match, pctldev));
2271 EXPORT_SYMBOL_GPL(devm_pinctrl_unregister);
2273 static int __init pinctrl_init(void)
2275 pr_info("initialized pinctrl subsystem\n");
2276 pinctrl_init_debugfs();
2280 /* init early since many drivers really need to initialized pinmux early */
2281 core_initcall(pinctrl_init);