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 * License terms: GNU General Public License (GPL) version 2
12 #define pr_fmt(fmt) "pinctrl core: " fmt
14 #include <linux/kernel.h>
15 #include <linux/export.h>
16 #include <linux/init.h>
17 #include <linux/device.h>
18 #include <linux/slab.h>
19 #include <linux/radix-tree.h>
20 #include <linux/err.h>
21 #include <linux/list.h>
22 #include <linux/mutex.h>
23 #include <linux/spinlock.h>
24 #include <linux/sysfs.h>
25 #include <linux/debugfs.h>
26 #include <linux/seq_file.h>
27 #include <linux/pinctrl/pinctrl.h>
28 #include <linux/pinctrl/machine.h>
34 * struct pinctrl_hog - a list item to stash control hogs
35 * @node: pin control hog list node
36 * @map: map entry responsible for this hogging
37 * @pmx: the pin control hogged by this item
40 struct list_head node
;
41 struct pinctrl_map
const *map
;
45 /* Global list of pin control devices */
46 static DEFINE_MUTEX(pinctrldev_list_mutex
);
47 static LIST_HEAD(pinctrldev_list
);
49 /* List of pin controller handles */
50 static DEFINE_MUTEX(pinctrl_list_mutex
);
51 static LIST_HEAD(pinctrl_list
);
53 /* Global pinctrl maps */
54 static struct pinctrl_map
*pinctrl_maps
;
55 static unsigned pinctrl_maps_num
;
57 const char *pinctrl_dev_get_name(struct pinctrl_dev
*pctldev
)
59 /* We're not allowed to register devices without name */
60 return pctldev
->desc
->name
;
62 EXPORT_SYMBOL_GPL(pinctrl_dev_get_name
);
64 void *pinctrl_dev_get_drvdata(struct pinctrl_dev
*pctldev
)
66 return pctldev
->driver_data
;
68 EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata
);
71 * get_pinctrl_dev_from_devname() - look up pin controller device
72 * @devname: the name of a device instance, as returned by dev_name()
74 * Looks up a pin control device matching a certain device name or pure device
75 * pointer, the pure device pointer will take precedence.
77 struct pinctrl_dev
*get_pinctrl_dev_from_devname(const char *devname
)
79 struct pinctrl_dev
*pctldev
= NULL
;
85 mutex_lock(&pinctrldev_list_mutex
);
86 list_for_each_entry(pctldev
, &pinctrldev_list
, node
) {
87 if (!strcmp(dev_name(pctldev
->dev
), devname
)) {
88 /* Matched on device name */
93 mutex_unlock(&pinctrldev_list_mutex
);
95 return found
? pctldev
: NULL
;
98 struct pin_desc
*pin_desc_get(struct pinctrl_dev
*pctldev
, unsigned int pin
)
100 struct pin_desc
*pindesc
;
103 spin_lock_irqsave(&pctldev
->pin_desc_tree_lock
, flags
);
104 pindesc
= radix_tree_lookup(&pctldev
->pin_desc_tree
, pin
);
105 spin_unlock_irqrestore(&pctldev
->pin_desc_tree_lock
, flags
);
111 * pin_get_from_name() - look up a pin number from a name
112 * @pctldev: the pin control device to lookup the pin on
113 * @name: the name of the pin to look up
115 int pin_get_from_name(struct pinctrl_dev
*pctldev
, const char *name
)
119 /* The pin number can be retrived from the pin controller descriptor */
120 for (i
= 0; i
< pctldev
->desc
->npins
; i
++) {
121 struct pin_desc
*desc
;
123 pin
= pctldev
->desc
->pins
[i
].number
;
124 desc
= pin_desc_get(pctldev
, pin
);
125 /* Pin space may be sparse */
128 if (desc
->name
&& !strcmp(name
, desc
->name
))
136 * pin_is_valid() - check if pin exists on controller
137 * @pctldev: the pin control device to check the pin on
138 * @pin: pin to check, use the local pin controller index number
140 * This tells us whether a certain pin exist on a certain pin controller or
141 * not. Pin lists may be sparse, so some pins may not exist.
143 bool pin_is_valid(struct pinctrl_dev
*pctldev
, int pin
)
145 struct pin_desc
*pindesc
;
150 pindesc
= pin_desc_get(pctldev
, pin
);
156 EXPORT_SYMBOL_GPL(pin_is_valid
);
158 /* Deletes a range of pin descriptors */
159 static void pinctrl_free_pindescs(struct pinctrl_dev
*pctldev
,
160 const struct pinctrl_pin_desc
*pins
,
165 spin_lock(&pctldev
->pin_desc_tree_lock
);
166 for (i
= 0; i
< num_pins
; i
++) {
167 struct pin_desc
*pindesc
;
169 pindesc
= radix_tree_lookup(&pctldev
->pin_desc_tree
,
171 if (pindesc
!= NULL
) {
172 radix_tree_delete(&pctldev
->pin_desc_tree
,
174 if (pindesc
->dynamic_name
)
175 kfree(pindesc
->name
);
179 spin_unlock(&pctldev
->pin_desc_tree_lock
);
182 static int pinctrl_register_one_pin(struct pinctrl_dev
*pctldev
,
183 unsigned number
, const char *name
)
185 struct pin_desc
*pindesc
;
187 pindesc
= pin_desc_get(pctldev
, number
);
188 if (pindesc
!= NULL
) {
189 pr_err("pin %d already registered on %s\n", number
,
190 pctldev
->desc
->name
);
194 pindesc
= kzalloc(sizeof(*pindesc
), GFP_KERNEL
);
198 spin_lock_init(&pindesc
->lock
);
201 pindesc
->pctldev
= pctldev
;
203 /* Copy basic pin info */
205 pindesc
->name
= name
;
207 pindesc
->name
= kasprintf(GFP_KERNEL
, "PIN%u", number
);
208 if (pindesc
->name
== NULL
)
210 pindesc
->dynamic_name
= true;
213 spin_lock(&pctldev
->pin_desc_tree_lock
);
214 radix_tree_insert(&pctldev
->pin_desc_tree
, number
, pindesc
);
215 spin_unlock(&pctldev
->pin_desc_tree_lock
);
216 pr_debug("registered pin %d (%s) on %s\n",
217 number
, pindesc
->name
, pctldev
->desc
->name
);
221 static int pinctrl_register_pins(struct pinctrl_dev
*pctldev
,
222 struct pinctrl_pin_desc
const *pins
,
228 for (i
= 0; i
< num_descs
; i
++) {
229 ret
= pinctrl_register_one_pin(pctldev
,
230 pins
[i
].number
, pins
[i
].name
);
239 * pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
240 * @pctldev: pin controller device to check
241 * @gpio: gpio pin to check taken from the global GPIO pin space
243 * Tries to match a GPIO pin number to the ranges handled by a certain pin
244 * controller, return the range or NULL
246 static struct pinctrl_gpio_range
*
247 pinctrl_match_gpio_range(struct pinctrl_dev
*pctldev
, unsigned gpio
)
249 struct pinctrl_gpio_range
*range
= NULL
;
251 /* Loop over the ranges */
252 mutex_lock(&pctldev
->gpio_ranges_lock
);
253 list_for_each_entry(range
, &pctldev
->gpio_ranges
, node
) {
254 /* Check if we're in the valid range */
255 if (gpio
>= range
->base
&&
256 gpio
< range
->base
+ range
->npins
) {
257 mutex_unlock(&pctldev
->gpio_ranges_lock
);
261 mutex_unlock(&pctldev
->gpio_ranges_lock
);
267 * pinctrl_get_device_gpio_range() - find device for GPIO range
268 * @gpio: the pin to locate the pin controller for
269 * @outdev: the pin control device if found
270 * @outrange: the GPIO range if found
272 * Find the pin controller handling a certain GPIO pin from the pinspace of
273 * the GPIO subsystem, return the device and the matching GPIO range. Returns
274 * negative if the GPIO range could not be found in any device.
276 int pinctrl_get_device_gpio_range(unsigned gpio
,
277 struct pinctrl_dev
**outdev
,
278 struct pinctrl_gpio_range
**outrange
)
280 struct pinctrl_dev
*pctldev
= NULL
;
282 /* Loop over the pin controllers */
283 mutex_lock(&pinctrldev_list_mutex
);
284 list_for_each_entry(pctldev
, &pinctrldev_list
, node
) {
285 struct pinctrl_gpio_range
*range
;
287 range
= pinctrl_match_gpio_range(pctldev
, gpio
);
291 mutex_unlock(&pinctrldev_list_mutex
);
295 mutex_unlock(&pinctrldev_list_mutex
);
301 * pinctrl_add_gpio_range() - register a GPIO range for a controller
302 * @pctldev: pin controller device to add the range to
303 * @range: the GPIO range to add
305 * This adds a range of GPIOs to be handled by a certain pin controller. Call
306 * this to register handled ranges after registering your pin controller.
308 void pinctrl_add_gpio_range(struct pinctrl_dev
*pctldev
,
309 struct pinctrl_gpio_range
*range
)
311 mutex_lock(&pctldev
->gpio_ranges_lock
);
312 list_add(&range
->node
, &pctldev
->gpio_ranges
);
313 mutex_unlock(&pctldev
->gpio_ranges_lock
);
317 * pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller
318 * @pctldev: pin controller device to remove the range from
319 * @range: the GPIO range to remove
321 void pinctrl_remove_gpio_range(struct pinctrl_dev
*pctldev
,
322 struct pinctrl_gpio_range
*range
)
324 mutex_lock(&pctldev
->gpio_ranges_lock
);
325 list_del(&range
->node
);
326 mutex_unlock(&pctldev
->gpio_ranges_lock
);
330 * pinctrl_get_group_selector() - returns the group selector for a group
331 * @pctldev: the pin controller handling the group
332 * @pin_group: the pin group to look up
334 int pinctrl_get_group_selector(struct pinctrl_dev
*pctldev
,
335 const char *pin_group
)
337 const struct pinctrl_ops
*pctlops
= pctldev
->desc
->pctlops
;
338 unsigned group_selector
= 0;
340 while (pctlops
->list_groups(pctldev
, group_selector
) >= 0) {
341 const char *gname
= pctlops
->get_group_name(pctldev
,
343 if (!strcmp(gname
, pin_group
)) {
344 dev_dbg(pctldev
->dev
,
345 "found group selector %u for %s\n",
348 return group_selector
;
354 dev_err(pctldev
->dev
, "does not have pin group %s\n",
361 * pinctrl_request_gpio() - request a single pin to be used in as GPIO
362 * @gpio: the GPIO pin number from the GPIO subsystem number space
364 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
365 * as part of their gpio_request() semantics, platforms and individual drivers
366 * shall *NOT* request GPIO pins to be muxed in.
368 int pinctrl_request_gpio(unsigned gpio
)
370 struct pinctrl_dev
*pctldev
;
371 struct pinctrl_gpio_range
*range
;
375 ret
= pinctrl_get_device_gpio_range(gpio
, &pctldev
, &range
);
379 /* Convert to the pin controllers number space */
380 pin
= gpio
- range
->base
+ range
->pin_base
;
382 return pinmux_request_gpio(pctldev
, range
, pin
, gpio
);
384 EXPORT_SYMBOL_GPL(pinctrl_request_gpio
);
387 * pinctrl_free_gpio() - free control on a single pin, currently used as GPIO
388 * @gpio: the GPIO pin number from the GPIO subsystem number space
390 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
391 * as part of their gpio_free() semantics, platforms and individual drivers
392 * shall *NOT* request GPIO pins to be muxed out.
394 void pinctrl_free_gpio(unsigned gpio
)
396 struct pinctrl_dev
*pctldev
;
397 struct pinctrl_gpio_range
*range
;
401 ret
= pinctrl_get_device_gpio_range(gpio
, &pctldev
, &range
);
405 /* Convert to the pin controllers number space */
406 pin
= gpio
- range
->base
+ range
->pin_base
;
408 return pinmux_free_gpio(pctldev
, pin
, range
);
410 EXPORT_SYMBOL_GPL(pinctrl_free_gpio
);
412 static int pinctrl_gpio_direction(unsigned gpio
, bool input
)
414 struct pinctrl_dev
*pctldev
;
415 struct pinctrl_gpio_range
*range
;
419 ret
= pinctrl_get_device_gpio_range(gpio
, &pctldev
, &range
);
423 /* Convert to the pin controllers number space */
424 pin
= gpio
- range
->base
+ range
->pin_base
;
426 return pinmux_gpio_direction(pctldev
, range
, pin
, input
);
430 * pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode
431 * @gpio: the GPIO pin number from the GPIO subsystem number space
433 * This function should *ONLY* be used from gpiolib-based GPIO drivers,
434 * as part of their gpio_direction_input() semantics, platforms and individual
435 * drivers shall *NOT* touch pin control GPIO calls.
437 int pinctrl_gpio_direction_input(unsigned gpio
)
439 return pinctrl_gpio_direction(gpio
, true);
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
)
453 return pinctrl_gpio_direction(gpio
, false);
455 EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output
);
458 * pinctrl_get() - retrieves the pin controller handle for a certain device
459 * @dev: the device to get the pin controller handle for
460 * @name: an optional specific control mapping name or NULL, the name is only
461 * needed if you want to have more than one mapping per device, or if you
462 * need an anonymous pin control (not tied to any specific device)
464 struct pinctrl
*pinctrl_get(struct device
*dev
, const char *name
)
466 struct pinctrl_map
const *map
= NULL
;
467 struct pinctrl_dev
*pctldev
= NULL
;
468 const char *devname
= NULL
;
471 unsigned num_maps
= 0;
475 /* We must have dev or ID or both */
477 return ERR_PTR(-EINVAL
);
480 devname
= dev_name(dev
);
482 pr_debug("get pin control handle %s for device %s\n", name
,
483 devname
? devname
: "(none)");
486 * create the state cookie holder struct pinctrl for each
487 * mapping, this is what consumers will get when requesting
488 * a pin control handle with pinctrl_get()
490 p
= kzalloc(sizeof(struct pinctrl
), GFP_KERNEL
);
492 return ERR_PTR(-ENOMEM
);
493 mutex_init(&p
->mutex
);
494 pinmux_init_pinctrl_handle(p
);
496 /* Iterate over the pin control maps to locate the right ones */
497 for (i
= 0; i
< pinctrl_maps_num
; i
++) {
498 map
= &pinctrl_maps
[i
];
502 * First, try to find the pctldev given in the map
504 pctldev
= get_pinctrl_dev_from_devname(map
->ctrl_dev_name
);
506 pr_warning("could not find a pinctrl device for pinmux function %s, fishy, they shall all have one\n",
508 pr_warning("given pinctrl device name: %s",
511 /* Continue to check the other mappings anyway... */
515 pr_debug("in map, found pctldev %s to handle function %s",
516 dev_name(pctldev
->dev
), map
->function
);
520 * If we're looking for a specific named map, this must match,
521 * else we loop and look for the next.
524 if (map
->name
== NULL
)
526 if (strcmp(map
->name
, name
))
531 * This is for the case where no device name is given, we
532 * already know that the function name matches from above
535 if (!map
->dev_name
&& (name
!= NULL
))
538 /* If the mapping has a device set up it must match */
540 (!devname
|| !strcmp(map
->dev_name
, devname
)))
544 /* If this map is applicable, then apply it */
546 ret
= pinmux_apply_muxmap(pctldev
, p
, dev
,
556 /* We should have atleast one map, right */
558 pr_err("could not find any mux maps for device %s, ID %s\n",
559 devname
? devname
: "(anonymous)",
560 name
? name
: "(undefined)");
562 return ERR_PTR(-EINVAL
);
565 pr_debug("found %u mux maps for device %s, UD %s\n",
567 devname
? devname
: "(anonymous)",
568 name
? name
: "(undefined)");
570 /* Add the pinmux to the global list */
571 mutex_lock(&pinctrl_list_mutex
);
572 list_add(&p
->node
, &pinctrl_list
);
573 mutex_unlock(&pinctrl_list_mutex
);
577 EXPORT_SYMBOL_GPL(pinctrl_get
);
580 * pinctrl_put() - release a previously claimed pin control handle
581 * @p: a pin control handle previously claimed by pinctrl_get()
583 void pinctrl_put(struct pinctrl
*p
)
588 mutex_lock(&p
->mutex
);
590 pr_warn("releasing pin control handle with active users!\n");
591 /* Free the groups and all acquired pins */
593 mutex_unlock(&p
->mutex
);
595 /* Remove from list */
596 mutex_lock(&pinctrl_list_mutex
);
598 mutex_unlock(&pinctrl_list_mutex
);
602 EXPORT_SYMBOL_GPL(pinctrl_put
);
605 * pinctrl_enable() - enable a certain pin controller setting
606 * @p: the pin control handle to enable, previously claimed by pinctrl_get()
608 int pinctrl_enable(struct pinctrl
*p
)
614 mutex_lock(&p
->mutex
);
615 if (p
->usecount
++ == 0) {
616 ret
= pinmux_enable(p
);
620 mutex_unlock(&p
->mutex
);
623 EXPORT_SYMBOL_GPL(pinctrl_enable
);
626 * pinctrl_disable() - disable a certain pin control setting
627 * @p: the pin control handle to disable, previously claimed by pinctrl_get()
629 void pinctrl_disable(struct pinctrl
*p
)
634 mutex_lock(&p
->mutex
);
635 if (--p
->usecount
== 0) {
638 mutex_unlock(&p
->mutex
);
640 EXPORT_SYMBOL_GPL(pinctrl_disable
);
643 * pinctrl_register_mappings() - register a set of pin controller mappings
644 * @maps: the pincontrol mappings table to register, this should be marked with
645 * __initdata so it can be discarded after boot, this function will
646 * perform a shallow copy for the mapping entries.
647 * @num_maps: the number of maps in the mapping table
649 * Only call this once during initialization of your machine, the function is
650 * tagged as __init and won't be callable after init has completed. The map
651 * passed into this function will be owned by the pinmux core and cannot be
654 int __init
pinctrl_register_mappings(struct pinctrl_map
const *maps
,
660 pr_debug("add %d pinmux maps\n", num_maps
);
662 /* First sanity check the new mapping */
663 for (i
= 0; i
< num_maps
; i
++) {
665 pr_err("failed to register map %d: no map name given\n",
670 if (!maps
[i
].ctrl_dev_name
) {
671 pr_err("failed to register map %s (%d): no pin control device given\n",
676 if (!maps
[i
].function
) {
677 pr_err("failed to register map %s (%d): no function ID given\n",
682 if (!maps
[i
].dev_name
)
683 pr_debug("add system map %s function %s with no device\n",
687 pr_debug("register map %s, function %s\n",
693 * Make a copy of the map array - string pointers will end up in the
694 * kernel const section anyway so these do not need to be deep copied.
696 if (!pinctrl_maps_num
) {
697 /* On first call, just copy them */
698 tmp_maps
= kmemdup(maps
,
699 sizeof(struct pinctrl_map
) * num_maps
,
704 /* Subsequent calls, reallocate array to new size */
705 size_t oldsize
= sizeof(struct pinctrl_map
) * pinctrl_maps_num
;
706 size_t newsize
= sizeof(struct pinctrl_map
) * num_maps
;
708 tmp_maps
= krealloc(pinctrl_maps
,
709 oldsize
+ newsize
, GFP_KERNEL
);
712 memcpy((tmp_maps
+ oldsize
), maps
, newsize
);
715 pinctrl_maps
= tmp_maps
;
716 pinctrl_maps_num
+= num_maps
;
720 /* Hog a single map entry and add to the hoglist */
721 static int pinctrl_hog_map(struct pinctrl_dev
*pctldev
,
722 struct pinctrl_map
const *map
)
724 struct pinctrl_hog
*hog
;
728 hog
= kzalloc(sizeof(struct pinctrl_hog
), GFP_KERNEL
);
732 p
= pinctrl_get(pctldev
->dev
, map
->name
);
735 dev_err(pctldev
->dev
,
736 "could not get the %s pin control mapping for hogging\n",
741 ret
= pinctrl_enable(p
);
745 dev_err(pctldev
->dev
,
746 "could not enable the %s pin control mapping for hogging\n",
754 dev_info(pctldev
->dev
, "hogged map %s, function %s\n", map
->name
,
756 mutex_lock(&pctldev
->pinctrl_hogs_lock
);
757 list_add(&hog
->node
, &pctldev
->pinctrl_hogs
);
758 mutex_unlock(&pctldev
->pinctrl_hogs_lock
);
764 * pinctrl_hog_maps() - hog specific map entries on controller device
765 * @pctldev: the pin control device to hog entries on
767 * When the pin controllers are registered, there may be some specific pinmux
768 * map entries that need to be hogged, i.e. get+enabled until the system shuts
771 int pinctrl_hog_maps(struct pinctrl_dev
*pctldev
)
773 struct device
*dev
= pctldev
->dev
;
774 const char *devname
= dev_name(dev
);
778 INIT_LIST_HEAD(&pctldev
->pinctrl_hogs
);
779 mutex_init(&pctldev
->pinctrl_hogs_lock
);
781 for (i
= 0; i
< pinctrl_maps_num
; i
++) {
782 struct pinctrl_map
const *map
= &pinctrl_maps
[i
];
784 if (map
->ctrl_dev_name
&&
785 !strcmp(map
->ctrl_dev_name
, devname
) &&
786 !strcmp(map
->dev_name
, devname
)) {
787 /* OK time to hog! */
788 ret
= pinctrl_hog_map(pctldev
, map
);
797 * pinctrl_unhog_maps() - unhog specific map entries on controller device
798 * @pctldev: the pin control device to unhog entries on
800 void pinctrl_unhog_maps(struct pinctrl_dev
*pctldev
)
802 struct list_head
*node
, *tmp
;
804 mutex_lock(&pctldev
->pinctrl_hogs_lock
);
805 list_for_each_safe(node
, tmp
, &pctldev
->pinctrl_hogs
) {
806 struct pinctrl_hog
*hog
=
807 list_entry(node
, struct pinctrl_hog
, node
);
808 pinctrl_disable(hog
->p
);
813 mutex_unlock(&pctldev
->pinctrl_hogs_lock
);
816 #ifdef CONFIG_DEBUG_FS
818 static int pinctrl_pins_show(struct seq_file
*s
, void *what
)
820 struct pinctrl_dev
*pctldev
= s
->private;
821 const struct pinctrl_ops
*ops
= pctldev
->desc
->pctlops
;
824 seq_printf(s
, "registered pins: %d\n", pctldev
->desc
->npins
);
826 /* The pin number can be retrived from the pin controller descriptor */
827 for (i
= 0; i
< pctldev
->desc
->npins
; i
++) {
828 struct pin_desc
*desc
;
830 pin
= pctldev
->desc
->pins
[i
].number
;
831 desc
= pin_desc_get(pctldev
, pin
);
832 /* Pin space may be sparse */
836 seq_printf(s
, "pin %d (%s) ", pin
,
837 desc
->name
? desc
->name
: "unnamed");
839 /* Driver-specific info per pin */
840 if (ops
->pin_dbg_show
)
841 ops
->pin_dbg_show(pctldev
, s
, pin
);
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 seq_puts(s
, "registered pin groups:\n");
860 while (ops
->list_groups(pctldev
, selector
) >= 0) {
861 const unsigned *pins
;
863 const char *gname
= ops
->get_group_name(pctldev
, selector
);
867 ret
= ops
->get_group_pins(pctldev
, selector
,
870 seq_printf(s
, "%s [ERROR GETTING PINS]\n",
873 seq_printf(s
, "group: %s, pins = [ ", gname
);
874 for (i
= 0; i
< num_pins
; i
++)
875 seq_printf(s
, "%d ", pins
[i
]);
885 static int pinctrl_gpioranges_show(struct seq_file
*s
, void *what
)
887 struct pinctrl_dev
*pctldev
= s
->private;
888 struct pinctrl_gpio_range
*range
= NULL
;
890 seq_puts(s
, "GPIO ranges handled:\n");
892 /* Loop over the ranges */
893 mutex_lock(&pctldev
->gpio_ranges_lock
);
894 list_for_each_entry(range
, &pctldev
->gpio_ranges
, node
) {
895 seq_printf(s
, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
896 range
->id
, range
->name
,
897 range
->base
, (range
->base
+ range
->npins
- 1),
899 (range
->pin_base
+ range
->npins
- 1));
901 mutex_unlock(&pctldev
->gpio_ranges_lock
);
906 static int pinctrl_maps_show(struct seq_file
*s
, void *what
)
910 seq_puts(s
, "Pinctrl maps:\n");
912 for (i
= 0; i
< pinctrl_maps_num
; i
++) {
913 struct pinctrl_map
const *map
= &pinctrl_maps
[i
];
915 seq_printf(s
, "%s:\n", map
->name
);
917 seq_printf(s
, " device: %s\n",
920 seq_printf(s
, " SYSTEM MUX\n");
921 seq_printf(s
, " controlling device %s\n",
923 seq_printf(s
, " function: %s\n", map
->function
);
924 seq_printf(s
, " group: %s\n", map
->group
? map
->group
:
930 static int pinmux_hogs_show(struct seq_file
*s
, void *what
)
932 struct pinctrl_dev
*pctldev
= s
->private;
933 struct pinctrl_hog
*hog
;
935 seq_puts(s
, "Pin control map hogs held by device\n");
937 list_for_each_entry(hog
, &pctldev
->pinctrl_hogs
, node
)
938 seq_printf(s
, "%s\n", hog
->map
->name
);
943 static int pinctrl_devices_show(struct seq_file
*s
, void *what
)
945 struct pinctrl_dev
*pctldev
;
947 seq_puts(s
, "name [pinmux] [pinconf]\n");
948 mutex_lock(&pinctrldev_list_mutex
);
949 list_for_each_entry(pctldev
, &pinctrldev_list
, node
) {
950 seq_printf(s
, "%s ", pctldev
->desc
->name
);
951 if (pctldev
->desc
->pmxops
)
955 if (pctldev
->desc
->confops
)
961 mutex_unlock(&pinctrldev_list_mutex
);
966 static int pinctrl_show(struct seq_file
*s
, void *what
)
970 seq_puts(s
, "Requested pin control handlers their pinmux maps:\n");
971 list_for_each_entry(p
, &pinctrl_list
, node
) {
972 struct pinctrl_dev
*pctldev
= p
->pctldev
;
975 seq_puts(s
, "NO PIN CONTROLLER DEVICE\n");
979 seq_printf(s
, "device: %s",
980 pinctrl_dev_get_name(p
->pctldev
));
982 pinmux_dbg_show(s
, p
);
984 seq_printf(s
, " users: %u map-> %s\n",
986 p
->dev
? dev_name(p
->dev
) : "(system)");
992 static int pinctrl_pins_open(struct inode
*inode
, struct file
*file
)
994 return single_open(file
, pinctrl_pins_show
, inode
->i_private
);
997 static int pinctrl_groups_open(struct inode
*inode
, struct file
*file
)
999 return single_open(file
, pinctrl_groups_show
, inode
->i_private
);
1002 static int pinctrl_gpioranges_open(struct inode
*inode
, struct file
*file
)
1004 return single_open(file
, pinctrl_gpioranges_show
, inode
->i_private
);
1007 static int pinctrl_maps_open(struct inode
*inode
, struct file
*file
)
1009 return single_open(file
, pinctrl_maps_show
, inode
->i_private
);
1012 static int pinmux_hogs_open(struct inode
*inode
, struct file
*file
)
1014 return single_open(file
, pinmux_hogs_show
, inode
->i_private
);
1017 static int pinctrl_devices_open(struct inode
*inode
, struct file
*file
)
1019 return single_open(file
, pinctrl_devices_show
, NULL
);
1022 static int pinctrl_open(struct inode
*inode
, struct file
*file
)
1024 return single_open(file
, pinctrl_show
, NULL
);
1027 static const struct file_operations pinctrl_pins_ops
= {
1028 .open
= pinctrl_pins_open
,
1030 .llseek
= seq_lseek
,
1031 .release
= single_release
,
1034 static const struct file_operations pinctrl_groups_ops
= {
1035 .open
= pinctrl_groups_open
,
1037 .llseek
= seq_lseek
,
1038 .release
= single_release
,
1041 static const struct file_operations pinctrl_gpioranges_ops
= {
1042 .open
= pinctrl_gpioranges_open
,
1044 .llseek
= seq_lseek
,
1045 .release
= single_release
,
1048 static const struct file_operations pinctrl_maps_ops
= {
1049 .open
= pinctrl_maps_open
,
1051 .llseek
= seq_lseek
,
1052 .release
= single_release
,
1055 static const struct file_operations pinmux_hogs_ops
= {
1056 .open
= pinmux_hogs_open
,
1058 .llseek
= seq_lseek
,
1059 .release
= single_release
,
1062 static const struct file_operations pinctrl_devices_ops
= {
1063 .open
= pinctrl_devices_open
,
1065 .llseek
= seq_lseek
,
1066 .release
= single_release
,
1069 static const struct file_operations pinctrl_ops
= {
1070 .open
= pinctrl_open
,
1072 .llseek
= seq_lseek
,
1073 .release
= single_release
,
1076 static struct dentry
*debugfs_root
;
1078 static void pinctrl_init_device_debugfs(struct pinctrl_dev
*pctldev
)
1080 struct dentry
*device_root
;
1082 device_root
= debugfs_create_dir(dev_name(pctldev
->dev
),
1084 pctldev
->device_root
= device_root
;
1086 if (IS_ERR(device_root
) || !device_root
) {
1087 pr_warn("failed to create debugfs directory for %s\n",
1088 dev_name(pctldev
->dev
));
1091 debugfs_create_file("pins", S_IFREG
| S_IRUGO
,
1092 device_root
, pctldev
, &pinctrl_pins_ops
);
1093 debugfs_create_file("pingroups", S_IFREG
| S_IRUGO
,
1094 device_root
, pctldev
, &pinctrl_groups_ops
);
1095 debugfs_create_file("gpio-ranges", S_IFREG
| S_IRUGO
,
1096 device_root
, pctldev
, &pinctrl_gpioranges_ops
);
1097 debugfs_create_file("pinctrl-maps", S_IFREG
| S_IRUGO
,
1098 device_root
, pctldev
, &pinctrl_maps_ops
);
1099 debugfs_create_file("pinmux-hogs", S_IFREG
| S_IRUGO
,
1100 device_root
, pctldev
, &pinmux_hogs_ops
);
1101 pinmux_init_device_debugfs(device_root
, pctldev
);
1102 pinconf_init_device_debugfs(device_root
, pctldev
);
1105 static void pinctrl_remove_device_debugfs(struct pinctrl_dev
*pctldev
)
1107 debugfs_remove_recursive(pctldev
->device_root
);
1110 static void pinctrl_init_debugfs(void)
1112 debugfs_root
= debugfs_create_dir("pinctrl", NULL
);
1113 if (IS_ERR(debugfs_root
) || !debugfs_root
) {
1114 pr_warn("failed to create debugfs directory\n");
1115 debugfs_root
= NULL
;
1119 debugfs_create_file("pinctrl-devices", S_IFREG
| S_IRUGO
,
1120 debugfs_root
, NULL
, &pinctrl_devices_ops
);
1121 debugfs_create_file("pinctrl-handles", S_IFREG
| S_IRUGO
,
1122 debugfs_root
, NULL
, &pinctrl_ops
);
1125 #else /* CONFIG_DEBUG_FS */
1127 static void pinctrl_init_device_debugfs(struct pinctrl_dev
*pctldev
)
1131 static void pinctrl_init_debugfs(void)
1135 static void pinctrl_remove_device_debugfs(struct pinctrl_dev
*pctldev
)
1142 * pinctrl_register() - register a pin controller device
1143 * @pctldesc: descriptor for this pin controller
1144 * @dev: parent device for this pin controller
1145 * @driver_data: private pin controller data for this pin controller
1147 struct pinctrl_dev
*pinctrl_register(struct pinctrl_desc
*pctldesc
,
1148 struct device
*dev
, void *driver_data
)
1150 struct pinctrl_dev
*pctldev
;
1153 if (pctldesc
== NULL
)
1155 if (pctldesc
->name
== NULL
)
1158 pctldev
= kzalloc(sizeof(struct pinctrl_dev
), GFP_KERNEL
);
1159 if (pctldev
== NULL
)
1162 /* Initialize pin control device struct */
1163 pctldev
->owner
= pctldesc
->owner
;
1164 pctldev
->desc
= pctldesc
;
1165 pctldev
->driver_data
= driver_data
;
1166 INIT_RADIX_TREE(&pctldev
->pin_desc_tree
, GFP_KERNEL
);
1167 spin_lock_init(&pctldev
->pin_desc_tree_lock
);
1168 INIT_LIST_HEAD(&pctldev
->gpio_ranges
);
1169 mutex_init(&pctldev
->gpio_ranges_lock
);
1172 /* If we're implementing pinmuxing, check the ops for sanity */
1173 if (pctldesc
->pmxops
) {
1174 ret
= pinmux_check_ops(pctldev
);
1176 pr_err("%s pinmux ops lacks necessary functions\n",
1182 /* If we're implementing pinconfig, check the ops for sanity */
1183 if (pctldesc
->confops
) {
1184 ret
= pinconf_check_ops(pctldev
);
1186 pr_err("%s pin config ops lacks necessary functions\n",
1192 /* Register all the pins */
1193 pr_debug("try to register %d pins on %s...\n",
1194 pctldesc
->npins
, pctldesc
->name
);
1195 ret
= pinctrl_register_pins(pctldev
, pctldesc
->pins
, pctldesc
->npins
);
1197 pr_err("error during pin registration\n");
1198 pinctrl_free_pindescs(pctldev
, pctldesc
->pins
,
1203 pinctrl_init_device_debugfs(pctldev
);
1204 mutex_lock(&pinctrldev_list_mutex
);
1205 list_add(&pctldev
->node
, &pinctrldev_list
);
1206 mutex_unlock(&pinctrldev_list_mutex
);
1207 pinctrl_hog_maps(pctldev
);
1214 EXPORT_SYMBOL_GPL(pinctrl_register
);
1217 * pinctrl_unregister() - unregister pinmux
1218 * @pctldev: pin controller to unregister
1220 * Called by pinmux drivers to unregister a pinmux.
1222 void pinctrl_unregister(struct pinctrl_dev
*pctldev
)
1224 if (pctldev
== NULL
)
1227 pinctrl_remove_device_debugfs(pctldev
);
1228 pinctrl_unhog_maps(pctldev
);
1229 /* TODO: check that no pinmuxes are still active? */
1230 mutex_lock(&pinctrldev_list_mutex
);
1231 list_del(&pctldev
->node
);
1232 mutex_unlock(&pinctrldev_list_mutex
);
1233 /* Destroy descriptor tree */
1234 pinctrl_free_pindescs(pctldev
, pctldev
->desc
->pins
,
1235 pctldev
->desc
->npins
);
1238 EXPORT_SYMBOL_GPL(pinctrl_unregister
);
1240 static int __init
pinctrl_init(void)
1242 pr_info("initialized pinctrl subsystem\n");
1243 pinctrl_init_debugfs();
1247 /* init early since many drivers really need to initialized pinmux early */
1248 core_initcall(pinctrl_init
);