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/export.h>
18 #include <linux/init.h>
19 #include <linux/device.h>
20 #include <linux/slab.h>
21 #include <linux/err.h>
22 #include <linux/list.h>
23 #include <linux/sysfs.h>
24 #include <linux/debugfs.h>
25 #include <linux/seq_file.h>
26 #include <linux/pinctrl/pinctrl.h>
27 #include <linux/pinctrl/machine.h>
33 * struct pinctrl_maps - a list item containing part of the mapping table
34 * @node: mapping table list node
35 * @maps: array of mapping table entries
36 * @num_maps: the number of entries in @maps
39 struct list_head node;
40 struct pinctrl_map const *maps;
44 /* Mutex taken by all entry points */
45 DEFINE_MUTEX(pinctrl_mutex);
47 /* Global list of pin control devices (struct pinctrl_dev) */
48 static LIST_HEAD(pinctrldev_list);
50 /* List of pin controller handles (struct pinctrl) */
51 static LIST_HEAD(pinctrl_list);
53 /* List of pinctrl maps (struct pinctrl_maps) */
54 static LIST_HEAD(pinctrl_maps);
56 #define for_each_maps(_maps_node_, _i_, _map_) \
57 list_for_each_entry(_maps_node_, &pinctrl_maps, node) \
58 for (_i_ = 0, _map_ = &_maps_node_->maps[_i_]; \
59 _i_ < _maps_node_->num_maps; \
60 i++, _map_ = &_maps_node_->maps[_i_])
62 const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev)
64 /* We're not allowed to register devices without name */
65 return pctldev->desc->name;
67 EXPORT_SYMBOL_GPL(pinctrl_dev_get_name);
69 void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev)
71 return pctldev->driver_data;
73 EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata);
76 * get_pinctrl_dev_from_devname() - look up pin controller device
77 * @devname: the name of a device instance, as returned by dev_name()
79 * Looks up a pin control device matching a certain device name or pure device
80 * pointer, the pure device pointer will take precedence.
82 struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname)
84 struct pinctrl_dev *pctldev = NULL;
90 list_for_each_entry(pctldev, &pinctrldev_list, node) {
91 if (!strcmp(dev_name(pctldev->dev), devname)) {
92 /* Matched on device name */
98 return found ? pctldev : NULL;
102 * pin_get_from_name() - look up a pin number from a name
103 * @pctldev: the pin control device to lookup the pin on
104 * @name: the name of the pin to look up
106 int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name)
110 /* The pin number can be retrived from the pin controller descriptor */
111 for (i = 0; i < pctldev->desc->npins; i++) {
112 struct pin_desc *desc;
114 pin = pctldev->desc->pins[i].number;
115 desc = pin_desc_get(pctldev, pin);
116 /* Pin space may be sparse */
119 if (desc->name && !strcmp(name, desc->name))
127 * pin_is_valid() - check if pin exists on controller
128 * @pctldev: the pin control device to check the pin on
129 * @pin: pin to check, use the local pin controller index number
131 * This tells us whether a certain pin exist on a certain pin controller or
132 * not. Pin lists may be sparse, so some pins may not exist.
134 bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
136 struct pin_desc *pindesc;
141 mutex_lock(&pinctrl_mutex);
142 pindesc = pin_desc_get(pctldev, pin);
143 mutex_unlock(&pinctrl_mutex);
145 return pindesc != NULL;
147 EXPORT_SYMBOL_GPL(pin_is_valid);
149 /* Deletes a range of pin descriptors */
150 static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev,
151 const struct pinctrl_pin_desc *pins,
156 for (i = 0; i < num_pins; i++) {
157 struct pin_desc *pindesc;
159 pindesc = radix_tree_lookup(&pctldev->pin_desc_tree,
161 if (pindesc != NULL) {
162 radix_tree_delete(&pctldev->pin_desc_tree,
164 if (pindesc->dynamic_name)
165 kfree(pindesc->name);
171 static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
172 unsigned number, const char *name)
174 struct pin_desc *pindesc;
176 pindesc = pin_desc_get(pctldev, number);
177 if (pindesc != NULL) {
178 pr_err("pin %d already registered on %s\n", number,
179 pctldev->desc->name);
183 pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL);
184 if (pindesc == NULL) {
185 dev_err(pctldev->dev, "failed to alloc struct pin_desc\n");
190 pindesc->pctldev = pctldev;
192 /* Copy basic pin info */
194 pindesc->name = name;
196 pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number);
197 if (pindesc->name == NULL)
199 pindesc->dynamic_name = true;
202 radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc);
203 pr_debug("registered pin %d (%s) on %s\n",
204 number, pindesc->name, pctldev->desc->name);
208 static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
209 struct pinctrl_pin_desc const *pins,
215 for (i = 0; i < num_descs; i++) {
216 ret = pinctrl_register_one_pin(pctldev,
217 pins[i].number, pins[i].name);
226 * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
227 * @pctldev: pin controller device to check
228 * @gpio: gpio pin to check taken from the global GPIO pin space
230 * Tries to match a GPIO pin number to the ranges handled by a certain pin
231 * controller, return the range or NULL
233 static struct pinctrl_gpio_range *
234 pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
236 struct pinctrl_gpio_range *range = NULL;
238 /* Loop over the ranges */
239 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
240 /* Check if we're in the valid range */
241 if (gpio >= range->base &&
242 gpio < range->base + range->npins) {
251 * pinctrl_get_device_gpio_range() - find device for GPIO range
252 * @gpio: the pin to locate the pin controller for
253 * @outdev: the pin control device if found
254 * @outrange: the GPIO range if found
256 * Find the pin controller handling a certain GPIO pin from the pinspace of
257 * the GPIO subsystem, return the device and the matching GPIO range. Returns
258 * negative if the GPIO range could not be found in any device.
260 static int pinctrl_get_device_gpio_range(unsigned gpio,
261 struct pinctrl_dev **outdev,
262 struct pinctrl_gpio_range **outrange)
264 struct pinctrl_dev *pctldev = NULL;
266 /* Loop over the pin controllers */
267 list_for_each_entry(pctldev, &pinctrldev_list, node) {
268 struct pinctrl_gpio_range *range;
270 range = pinctrl_match_gpio_range(pctldev, gpio);
282 * pinctrl_add_gpio_range() - register a GPIO range for a controller
283 * @pctldev: pin controller device to add the range to
284 * @range: the GPIO range to add
286 * This adds a range of GPIOs to be handled by a certain pin controller. Call
287 * this to register handled ranges after registering your pin controller.
289 void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
290 struct pinctrl_gpio_range *range)
292 mutex_lock(&pinctrl_mutex);
293 list_add_tail(&range->node, &pctldev->gpio_ranges);
294 mutex_unlock(&pinctrl_mutex);
296 EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
299 * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller
300 * @pctldev: pin controller device to remove the range from
301 * @range: the GPIO range to remove
303 void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
304 struct pinctrl_gpio_range *range)
306 mutex_lock(&pinctrl_mutex);
307 list_del(&range->node);
308 mutex_unlock(&pinctrl_mutex);
310 EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range);
313 * pinctrl_get_group_selector() - returns the group selector for a group
314 * @pctldev: the pin controller handling the group
315 * @pin_group: the pin group to look up
317 int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
318 const char *pin_group)
320 const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
321 unsigned group_selector = 0;
323 while (pctlops->list_groups(pctldev, group_selector) >= 0) {
324 const char *gname = pctlops->get_group_name(pctldev,
326 if (!strcmp(gname, pin_group)) {
327 dev_dbg(pctldev->dev,
328 "found group selector %u for %s\n",
331 return group_selector;
337 dev_err(pctldev->dev, "does not have pin group %s\n",
344 * pinctrl_request_gpio() - request a single pin to be used in as GPIO
345 * @gpio: the GPIO pin number from the GPIO subsystem number space
347 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
348 * as part of their gpio_request() semantics, platforms and individual drivers
349 * shall *NOT* request GPIO pins to be muxed in.
351 int pinctrl_request_gpio(unsigned gpio)
353 struct pinctrl_dev *pctldev;
354 struct pinctrl_gpio_range *range;
358 mutex_lock(&pinctrl_mutex);
360 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
362 mutex_unlock(&pinctrl_mutex);
366 /* Convert to the pin controllers number space */
367 pin = gpio - range->base + range->pin_base;
369 ret = pinmux_request_gpio(pctldev, range, pin, gpio);
371 mutex_unlock(&pinctrl_mutex);
374 EXPORT_SYMBOL_GPL(pinctrl_request_gpio);
377 * pinctrl_free_gpio() - free control on a single pin, currently used as GPIO
378 * @gpio: the GPIO pin number from the GPIO subsystem number space
380 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
381 * as part of their gpio_free() semantics, platforms and individual drivers
382 * shall *NOT* request GPIO pins to be muxed out.
384 void pinctrl_free_gpio(unsigned gpio)
386 struct pinctrl_dev *pctldev;
387 struct pinctrl_gpio_range *range;
391 mutex_lock(&pinctrl_mutex);
393 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
395 mutex_unlock(&pinctrl_mutex);
399 /* Convert to the pin controllers number space */
400 pin = gpio - range->base + range->pin_base;
402 pinmux_free_gpio(pctldev, pin, range);
404 mutex_unlock(&pinctrl_mutex);
406 EXPORT_SYMBOL_GPL(pinctrl_free_gpio);
408 static int pinctrl_gpio_direction(unsigned gpio, bool input)
410 struct pinctrl_dev *pctldev;
411 struct pinctrl_gpio_range *range;
415 ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
419 /* Convert to the pin controllers number space */
420 pin = gpio - range->base + range->pin_base;
422 return pinmux_gpio_direction(pctldev, range, pin, input);
426 * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode
427 * @gpio: the GPIO pin number from the GPIO subsystem number space
429 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
430 * as part of their gpio_direction_input() semantics, platforms and individual
431 * drivers shall *NOT* touch pin control GPIO calls.
433 int pinctrl_gpio_direction_input(unsigned gpio)
436 mutex_lock(&pinctrl_mutex);
437 ret = pinctrl_gpio_direction(gpio, true);
438 mutex_unlock(&pinctrl_mutex);
441 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
444 * pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode
445 * @gpio: the GPIO pin number from the GPIO subsystem number space
447 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
448 * as part of their gpio_direction_output() semantics, platforms and individual
449 * drivers shall *NOT* touch pin control GPIO calls.
451 int pinctrl_gpio_direction_output(unsigned gpio)
454 mutex_lock(&pinctrl_mutex);
455 ret = pinctrl_gpio_direction(gpio, false);
456 mutex_unlock(&pinctrl_mutex);
459 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
461 static struct pinctrl_state *find_state(struct pinctrl *p,
464 struct pinctrl_state *state;
466 list_for_each_entry(state, &p->states, node)
467 if (!strcmp(state->name, name))
473 static struct pinctrl_state *create_state(struct pinctrl *p,
476 struct pinctrl_state *state;
478 state = kzalloc(sizeof(*state), GFP_KERNEL);
481 "failed to alloc struct pinctrl_state\n");
482 return ERR_PTR(-ENOMEM);
486 INIT_LIST_HEAD(&state->settings);
488 list_add_tail(&state->node, &p->states);
493 static int add_setting(struct pinctrl *p, struct pinctrl_map const *map)
495 struct pinctrl_state *state;
496 struct pinctrl_setting *setting;
499 state = find_state(p, map->name);
501 state = create_state(p, map->name);
503 return PTR_ERR(state);
505 setting = kzalloc(sizeof(*setting), GFP_KERNEL);
506 if (setting == NULL) {
508 "failed to alloc struct pinctrl_setting\n");
512 setting->pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
513 if (setting->pctldev == NULL) {
514 dev_err(p->dev, "unknown pinctrl device %s in map entry",
517 /* Eventually, this should trigger deferred probe */
521 ret = pinmux_map_to_setting(map, setting);
527 list_add_tail(&setting->node, &state->settings);
532 static struct pinctrl *find_pinctrl(struct device *dev)
536 list_for_each_entry(p, &pinctrldev_list, node)
543 static void pinctrl_put_locked(struct pinctrl *p, bool inlist);
545 static struct pinctrl *create_pinctrl(struct device *dev)
549 struct pinctrl_maps *maps_node;
551 struct pinctrl_map const *map;
555 * create the state cookie holder struct pinctrl for each
556 * mapping, this is what consumers will get when requesting
557 * a pin control handle with pinctrl_get()
559 p = kzalloc(sizeof(*p), GFP_KERNEL);
561 dev_err(dev, "failed to alloc struct pinctrl\n");
562 return ERR_PTR(-ENOMEM);
565 INIT_LIST_HEAD(&p->states);
567 devname = dev_name(dev);
569 /* Iterate over the pin control maps to locate the right ones */
570 for_each_maps(maps_node, i, map) {
571 /* Map must be for this device */
572 if (strcmp(map->dev_name, devname))
575 ret = add_setting(p, map);
577 pinctrl_put_locked(p, false);
582 /* Add the pinmux to the global list */
583 list_add_tail(&p->node, &pinctrl_list);
588 static struct pinctrl *pinctrl_get_locked(struct device *dev)
593 return ERR_PTR(-EINVAL);
595 p = find_pinctrl(dev);
597 return ERR_PTR(-EBUSY);
599 p = create_pinctrl(dev);
607 * pinctrl_get() - retrieves the pinctrl handle for a device
608 * @dev: the device to obtain the handle for
610 struct pinctrl *pinctrl_get(struct device *dev)
614 mutex_lock(&pinctrl_mutex);
615 p = pinctrl_get_locked(dev);
616 mutex_unlock(&pinctrl_mutex);
620 EXPORT_SYMBOL_GPL(pinctrl_get);
622 static void pinctrl_put_locked(struct pinctrl *p, bool inlist)
624 struct pinctrl_state *state, *n1;
625 struct pinctrl_setting *setting, *n2;
627 list_for_each_entry_safe(state, n1, &p->states, node) {
628 list_for_each_entry_safe(setting, n2, &state->settings, node) {
629 if (state == p->state)
630 pinmux_disable_setting(setting);
631 pinmux_free_setting(setting);
632 list_del(&setting->node);
635 list_del(&state->node);
645 * pinctrl_put() - release a previously claimed pinctrl handle
646 * @p: the pinctrl handle to release
648 void pinctrl_put(struct pinctrl *p)
650 mutex_lock(&pinctrl_mutex);
651 pinctrl_put_locked(p, true);
652 mutex_unlock(&pinctrl_mutex);
654 EXPORT_SYMBOL_GPL(pinctrl_put);
656 static struct pinctrl_state *pinctrl_lookup_state_locked(struct pinctrl *p,
659 struct pinctrl_state *state;
661 state = find_state(p, name);
663 return ERR_PTR(-ENODEV);
669 * pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle
670 * @p: the pinctrl handle to retrieve the state from
671 * @name: the state name to retrieve
673 struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, const char *name)
675 struct pinctrl_state *s;
677 mutex_lock(&pinctrl_mutex);
678 s = pinctrl_lookup_state_locked(p, name);
679 mutex_unlock(&pinctrl_mutex);
683 EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
685 static int pinctrl_select_state_locked(struct pinctrl *p,
686 struct pinctrl_state *state)
688 struct pinctrl_setting *setting, *setting2;
691 if (p->state == state)
696 * The set of groups with a mux configuration in the old state
697 * may not be identical to the set of groups with a mux setting
698 * in the new state. While this might be unusual, it's entirely
699 * possible for the "user"-supplied mapping table to be written
700 * that way. For each group that was configured in the old state
701 * but not in the new state, this code puts that group into a
702 * safe/disabled state.
704 list_for_each_entry(setting, &p->state->settings, node) {
706 list_for_each_entry(setting2, &state->settings, node) {
707 if (setting2->group_selector ==
708 setting->group_selector) {
714 pinmux_disable_setting(setting);
720 /* Apply all the settings for the new state */
721 list_for_each_entry(setting, &state->settings, node) {
722 ret = pinmux_enable_setting(setting);
724 /* FIXME: Difficult to return to prev state */
733 * pinctrl_select() - select/activate/program a pinctrl state to HW
734 * @p: the pinctrl handle for the device that requests configuratio
735 * @state: the state handle to select/activate/program
737 int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
741 mutex_lock(&pinctrl_mutex);
742 ret = pinctrl_select_state_locked(p, state);
743 mutex_unlock(&pinctrl_mutex);
747 EXPORT_SYMBOL_GPL(pinctrl_select_state);
750 * pinctrl_register_mappings() - register a set of pin controller mappings
751 * @maps: the pincontrol mappings table to register. This should probably be
752 * marked with __initdata so it can be discarded after boot. This
753 * function will perform a shallow copy for the mapping entries.
754 * @num_maps: the number of maps in the mapping table
756 int pinctrl_register_mappings(struct pinctrl_map const *maps,
760 struct pinctrl_maps *maps_node;
762 pr_debug("add %d pinmux maps\n", num_maps);
764 /* First sanity check the new mapping */
765 for (i = 0; i < num_maps; i++) {
767 pr_err("failed to register map %d: no map name given\n",
772 if (!maps[i].ctrl_dev_name) {
773 pr_err("failed to register map %s (%d): no pin control device given\n",
778 if (!maps[i].function) {
779 pr_err("failed to register map %s (%d): no function ID given\n",
784 if (!maps[i].dev_name) {
785 pr_err("failed to register map %s (%d): no device given\n",
791 maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL);
793 pr_err("failed to alloc struct pinctrl_maps\n");
797 maps_node->num_maps = num_maps;
798 maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps, GFP_KERNEL);
799 if (!maps_node->maps) {
800 pr_err("failed to duplicate mapping table\n");
805 mutex_lock(&pinctrl_mutex);
806 list_add_tail(&maps_node->node, &pinctrl_maps);
807 mutex_unlock(&pinctrl_mutex);
812 #ifdef CONFIG_DEBUG_FS
814 static int pinctrl_pins_show(struct seq_file *s, void *what)
816 struct pinctrl_dev *pctldev = s->private;
817 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
820 seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
822 mutex_lock(&pinctrl_mutex);
824 /* The pin number can be retrived from the pin controller descriptor */
825 for (i = 0; i < pctldev->desc->npins; i++) {
826 struct pin_desc *desc;
828 pin = pctldev->desc->pins[i].number;
829 desc = pin_desc_get(pctldev, pin);
830 /* Pin space may be sparse */
834 seq_printf(s, "pin %d (%s) ", pin,
835 desc->name ? desc->name : "unnamed");
837 /* Driver-specific info per pin */
838 if (ops->pin_dbg_show)
839 ops->pin_dbg_show(pctldev, s, pin);
844 mutex_unlock(&pinctrl_mutex);
849 static int pinctrl_groups_show(struct seq_file *s, void *what)
851 struct pinctrl_dev *pctldev = s->private;
852 const struct pinctrl_ops *ops = pctldev->desc->pctlops;
853 unsigned selector = 0;
859 mutex_lock(&pinctrl_mutex);
861 seq_puts(s, "registered pin groups:\n");
862 while (ops->list_groups(pctldev, selector) >= 0) {
863 const unsigned *pins;
865 const char *gname = ops->get_group_name(pctldev, selector);
869 ret = ops->get_group_pins(pctldev, selector,
872 seq_printf(s, "%s [ERROR GETTING PINS]\n",
875 seq_printf(s, "group: %s, pins = [ ", gname);
876 for (i = 0; i < num_pins; i++)
877 seq_printf(s, "%d ", pins[i]);
883 mutex_unlock(&pinctrl_mutex);
888 static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
890 struct pinctrl_dev *pctldev = s->private;
891 struct pinctrl_gpio_range *range = NULL;
893 seq_puts(s, "GPIO ranges handled:\n");
895 mutex_lock(&pinctrl_mutex);
897 /* Loop over the ranges */
898 list_for_each_entry(range, &pctldev->gpio_ranges, node) {
899 seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
900 range->id, range->name,
901 range->base, (range->base + range->npins - 1),
903 (range->pin_base + range->npins - 1));
906 mutex_unlock(&pinctrl_mutex);
911 static int pinctrl_devices_show(struct seq_file *s, void *what)
913 struct pinctrl_dev *pctldev;
915 seq_puts(s, "name [pinmux] [pinconf]\n");
917 mutex_lock(&pinctrl_mutex);
919 list_for_each_entry(pctldev, &pinctrldev_list, node) {
920 seq_printf(s, "%s ", pctldev->desc->name);
921 if (pctldev->desc->pmxops)
925 if (pctldev->desc->confops)
932 mutex_unlock(&pinctrl_mutex);
937 static int pinctrl_maps_show(struct seq_file *s, void *what)
939 struct pinctrl_maps *maps_node;
941 struct pinctrl_map const *map;
943 seq_puts(s, "Pinctrl maps:\n");
945 mutex_lock(&pinctrl_mutex);
947 for_each_maps(maps_node, i, map) {
948 seq_printf(s, "%s:\n", map->name);
949 seq_printf(s, " device: %s\n", map->dev_name);
950 seq_printf(s, " controlling device %s\n", map->ctrl_dev_name);
951 seq_printf(s, " function: %s\n", map->function);
952 seq_printf(s, " group: %s\n", map->group ? map->group :
956 mutex_unlock(&pinctrl_mutex);
961 static int pinctrl_show(struct seq_file *s, void *what)
964 struct pinctrl_state *state;
965 struct pinctrl_setting *setting;
967 seq_puts(s, "Requested pin control handlers their pinmux maps:\n");
969 mutex_lock(&pinctrl_mutex);
971 list_for_each_entry(p, &pinctrl_list, node) {
972 seq_printf(s, "device: %s current state: %s\n",
974 p->state ? p->state->name : "none");
976 list_for_each_entry(state, &p->states, node) {
977 seq_printf(s, " state: %s\n", state->name);
979 list_for_each_entry(setting, &state->settings, node) {
981 pinmux_dbg_show(s, setting);
986 mutex_unlock(&pinctrl_mutex);
991 static int pinctrl_pins_open(struct inode *inode, struct file *file)
993 return single_open(file, pinctrl_pins_show, inode->i_private);
996 static int pinctrl_groups_open(struct inode *inode, struct file *file)
998 return single_open(file, pinctrl_groups_show, inode->i_private);
1001 static int pinctrl_gpioranges_open(struct inode *inode, struct file *file)
1003 return single_open(file, pinctrl_gpioranges_show, inode->i_private);
1006 static int pinctrl_devices_open(struct inode *inode, struct file *file)
1008 return single_open(file, pinctrl_devices_show, NULL);
1011 static int pinctrl_maps_open(struct inode *inode, struct file *file)
1013 return single_open(file, pinctrl_maps_show, NULL);
1016 static int pinctrl_open(struct inode *inode, struct file *file)
1018 return single_open(file, pinctrl_show, NULL);
1021 static const struct file_operations pinctrl_pins_ops = {
1022 .open = pinctrl_pins_open,
1024 .llseek = seq_lseek,
1025 .release = single_release,
1028 static const struct file_operations pinctrl_groups_ops = {
1029 .open = pinctrl_groups_open,
1031 .llseek = seq_lseek,
1032 .release = single_release,
1035 static const struct file_operations pinctrl_gpioranges_ops = {
1036 .open = pinctrl_gpioranges_open,
1038 .llseek = seq_lseek,
1039 .release = single_release,
1042 static const struct file_operations pinctrl_devices_ops = {
1043 .open = pinctrl_devices_open,
1045 .llseek = seq_lseek,
1046 .release = single_release,
1049 static const struct file_operations pinctrl_maps_ops = {
1050 .open = pinctrl_maps_open,
1052 .llseek = seq_lseek,
1053 .release = single_release,
1056 static const struct file_operations pinctrl_ops = {
1057 .open = pinctrl_open,
1059 .llseek = seq_lseek,
1060 .release = single_release,
1063 static struct dentry *debugfs_root;
1065 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1067 struct dentry *device_root;
1069 device_root = debugfs_create_dir(dev_name(pctldev->dev),
1071 pctldev->device_root = device_root;
1073 if (IS_ERR(device_root) || !device_root) {
1074 pr_warn("failed to create debugfs directory for %s\n",
1075 dev_name(pctldev->dev));
1078 debugfs_create_file("pins", S_IFREG | S_IRUGO,
1079 device_root, pctldev, &pinctrl_pins_ops);
1080 debugfs_create_file("pingroups", S_IFREG | S_IRUGO,
1081 device_root, pctldev, &pinctrl_groups_ops);
1082 debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO,
1083 device_root, pctldev, &pinctrl_gpioranges_ops);
1084 pinmux_init_device_debugfs(device_root, pctldev);
1085 pinconf_init_device_debugfs(device_root, pctldev);
1088 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1090 debugfs_remove_recursive(pctldev->device_root);
1093 static void pinctrl_init_debugfs(void)
1095 debugfs_root = debugfs_create_dir("pinctrl", NULL);
1096 if (IS_ERR(debugfs_root) || !debugfs_root) {
1097 pr_warn("failed to create debugfs directory\n");
1098 debugfs_root = NULL;
1102 debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO,
1103 debugfs_root, NULL, &pinctrl_devices_ops);
1104 debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO,
1105 debugfs_root, NULL, &pinctrl_maps_ops);
1106 debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO,
1107 debugfs_root, NULL, &pinctrl_ops);
1110 #else /* CONFIG_DEBUG_FS */
1112 static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1116 static void pinctrl_init_debugfs(void)
1120 static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1127 * pinctrl_register() - register a pin controller device
1128 * @pctldesc: descriptor for this pin controller
1129 * @dev: parent device for this pin controller
1130 * @driver_data: private pin controller data for this pin controller
1132 struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
1133 struct device *dev, void *driver_data)
1135 struct pinctrl_dev *pctldev;
1138 if (pctldesc == NULL)
1140 if (pctldesc->name == NULL)
1143 pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL);
1144 if (pctldev == NULL) {
1145 dev_err(dev, "failed to alloc struct pinctrl_dev\n");
1149 /* Initialize pin control device struct */
1150 pctldev->owner = pctldesc->owner;
1151 pctldev->desc = pctldesc;
1152 pctldev->driver_data = driver_data;
1153 INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
1154 INIT_LIST_HEAD(&pctldev->gpio_ranges);
1157 /* If we're implementing pinmuxing, check the ops for sanity */
1158 if (pctldesc->pmxops) {
1159 ret = pinmux_check_ops(pctldev);
1161 pr_err("%s pinmux ops lacks necessary functions\n",
1167 /* If we're implementing pinconfig, check the ops for sanity */
1168 if (pctldesc->confops) {
1169 ret = pinconf_check_ops(pctldev);
1171 pr_err("%s pin config ops lacks necessary functions\n",
1177 /* Register all the pins */
1178 pr_debug("try to register %d pins on %s...\n",
1179 pctldesc->npins, pctldesc->name);
1180 ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins);
1182 pr_err("error during pin registration\n");
1183 pinctrl_free_pindescs(pctldev, pctldesc->pins,
1188 mutex_lock(&pinctrl_mutex);
1190 list_add_tail(&pctldev->node, &pinctrldev_list);
1192 pctldev->p = pinctrl_get_locked(pctldev->dev);
1193 if (!IS_ERR(pctldev->p)) {
1194 struct pinctrl_state *s =
1195 pinctrl_lookup_state_locked(pctldev->p,
1196 PINCTRL_STATE_DEFAULT);
1198 pinctrl_select_state_locked(pctldev->p, s);
1201 mutex_unlock(&pinctrl_mutex);
1203 pinctrl_init_device_debugfs(pctldev);
1211 EXPORT_SYMBOL_GPL(pinctrl_register);
1214 * pinctrl_unregister() - unregister pinmux
1215 * @pctldev: pin controller to unregister
1217 * Called by pinmux drivers to unregister a pinmux.
1219 void pinctrl_unregister(struct pinctrl_dev *pctldev)
1221 if (pctldev == NULL)
1224 pinctrl_remove_device_debugfs(pctldev);
1226 mutex_lock(&pinctrl_mutex);
1228 if (!IS_ERR(pctldev->p))
1229 pinctrl_put_locked(pctldev->p, true);
1231 /* TODO: check that no pinmuxes are still active? */
1232 list_del(&pctldev->node);
1233 /* Destroy descriptor tree */
1234 pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
1235 pctldev->desc->npins);
1238 mutex_unlock(&pinctrl_mutex);
1240 EXPORT_SYMBOL_GPL(pinctrl_unregister);
1242 static int __init pinctrl_init(void)
1244 pr_info("initialized pinctrl subsystem\n");
1245 pinctrl_init_debugfs();
1249 /* init early since many drivers really need to initialized pinmux early */
1250 core_initcall(pinctrl_init);