Kernel

Kernel Git Source Tree

Root/drivers/pinctrl/core.c

1	/*
2	* Core driver for the pin control subsystem
3	*
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
7	*
8	* Author: Linus Walleij <linus.walleij@linaro.org>
9	*
10	* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
11	*
12	* License terms: GNU General Public License (GPL) version 2
13	*/
14	#define pr_fmt(fmt) "pinctrl core: " fmt
15
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/consumer.h>
27	#include <linux/pinctrl/pinctrl.h>
28	#include <linux/pinctrl/machine.h>
29	#include "core.h"
30	#include "devicetree.h"
31	#include "pinmux.h"
32	#include "pinconf.h"
33
34	/**
35	* struct pinctrl_maps - a list item containing part of the mapping table
36	* @node: mapping table list node
37	* @maps: array of mapping table entries
38	* @num_maps: the number of entries in @maps
39	*/
40	struct pinctrl_maps {
41	struct list_head node;
42	struct pinctrl_map const *maps;
43	unsigned num_maps;
44	};
45
46	static bool pinctrl_dummy_state;
47
48	/* Mutex taken by all entry points */
49	DEFINE_MUTEX(pinctrl_mutex);
50
51	/* Global list of pin control devices (struct pinctrl_dev) */
52	LIST_HEAD(pinctrldev_list);
53
54	/* List of pin controller handles (struct pinctrl) */
55	static LIST_HEAD(pinctrl_list);
56
57	/* List of pinctrl maps (struct pinctrl_maps) */
58	static LIST_HEAD(pinctrl_maps);
59
60	#define for_each_maps(_maps_node_, _i_, _map_) \
61	list_for_each_entry(_maps_node_, &pinctrl_maps, node) \
62	for (_i_ = 0, _map_ = &_maps_node_->maps[_i_]; \
63	_i_ < _maps_node_->num_maps; \
64	_i_++, _map_ = &_maps_node_->maps[_i_])
65
66	/**
67	* pinctrl_provide_dummies() - indicate if pinctrl provides dummy state support
68	*
69	* Usually this function is called by platforms without pinctrl driver support
70	* but run with some shared drivers using pinctrl APIs.
71	* After calling this function, the pinctrl core will return successfully
72	* with creating a dummy state for the driver to keep going smoothly.
73	*/
74	void pinctrl_provide_dummies(void)
75	{
76	pinctrl_dummy_state = true;
77	}
78
79	const char pinctrl_dev_get_name(struct pinctrl_dev pctldev)
80	{
81	/* We're not allowed to register devices without name */
82	return pctldev->desc->name;
83	}
84	EXPORT_SYMBOL_GPL(pinctrl_dev_get_name);
85
86	void pinctrl_dev_get_drvdata(struct pinctrl_dev pctldev)
87	{
88	return pctldev->driver_data;
89	}
90	EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata);
91
92	/**
93	* get_pinctrl_dev_from_devname() - look up pin controller device
94	* @devname: the name of a device instance, as returned by dev_name()
95	*
96	* Looks up a pin control device matching a certain device name or pure device
97	* pointer, the pure device pointer will take precedence.
98	*/
99	struct pinctrl_dev get_pinctrl_dev_from_devname(const char devname)
100	{
101	struct pinctrl_dev *pctldev = NULL;
102	bool found = false;
103
104	if (!devname)
105	return NULL;
106
107	list_for_each_entry(pctldev, &pinctrldev_list, node) {
108	if (!strcmp(dev_name(pctldev->dev), devname)) {
109	/* Matched on device name */
110	found = true;
111	break;
112	}
113	}
114
115	return found ? pctldev : NULL;
116	}
117
118	/**
119	* pin_get_from_name() - look up a pin number from a name
120	* @pctldev: the pin control device to lookup the pin on
121	* @name: the name of the pin to look up
122	*/
123	int pin_get_from_name(struct pinctrl_dev pctldev, const char name)
124	{
125	unsigned i, pin;
126
127	/* The pin number can be retrived from the pin controller descriptor */
128	for (i = 0; i < pctldev->desc->npins; i++) {
129	struct pin_desc *desc;
130
131	pin = pctldev->desc->pins[i].number;
132	desc = pin_desc_get(pctldev, pin);
133	/* Pin space may be sparse */
134	if (desc == NULL)
135	continue;
136	if (desc->name && !strcmp(name, desc->name))
137	return pin;
138	}
139
140	return -EINVAL;
141	}
142
143	/**
144	* pin_get_name_from_id() - look up a pin name from a pin id
145	* @pctldev: the pin control device to lookup the pin on
146	* @name: the name of the pin to look up
147	*/
148	const char pin_get_name(struct pinctrl_dev pctldev, const unsigned pin)
149	{
150	const struct pin_desc *desc;
151
152	desc = pin_desc_get(pctldev, pin);
153	if (desc == NULL) {
154	dev_err(pctldev->dev, "failed to get pin(%d) name\n",
155	pin);
156	return NULL;
157	}
158
159	return desc->name;
160	}
161
162	/**
163	* pin_is_valid() - check if pin exists on controller
164	* @pctldev: the pin control device to check the pin on
165	* @pin: pin to check, use the local pin controller index number
166	*
167	* This tells us whether a certain pin exist on a certain pin controller or
168	* not. Pin lists may be sparse, so some pins may not exist.
169	*/
170	bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
171	{
172	struct pin_desc *pindesc;
173
174	if (pin < 0)
175	return false;
176
177	mutex_lock(&pinctrl_mutex);
178	pindesc = pin_desc_get(pctldev, pin);
179	mutex_unlock(&pinctrl_mutex);
180
181	return pindesc != NULL;
182	}
183	EXPORT_SYMBOL_GPL(pin_is_valid);
184
185	/* Deletes a range of pin descriptors */
186	static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev,
187	const struct pinctrl_pin_desc *pins,
188	unsigned num_pins)
189	{
190	int i;
191
192	for (i = 0; i < num_pins; i++) {
193	struct pin_desc *pindesc;
194
195	pindesc = radix_tree_lookup(&pctldev->pin_desc_tree,
196	pins[i].number);
197	if (pindesc != NULL) {
198	radix_tree_delete(&pctldev->pin_desc_tree,
199	pins[i].number);
200	if (pindesc->dynamic_name)
201	kfree(pindesc->name);
202	}
203	kfree(pindesc);
204	}
205	}
206
207	static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
208	unsigned number, const char *name)
209	{
210	struct pin_desc *pindesc;
211
212	pindesc = pin_desc_get(pctldev, number);
213	if (pindesc != NULL) {
214	pr_err("pin %d already registered on %s\n", number,
215	pctldev->desc->name);
216	return -EINVAL;
217	}
218
219	pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL);
220	if (pindesc == NULL) {
221	dev_err(pctldev->dev, "failed to alloc struct pin_desc\n");
222	return -ENOMEM;
223	}
224
225	/* Set owner */
226	pindesc->pctldev = pctldev;
227
228	/* Copy basic pin info */
229	if (name) {
230	pindesc->name = name;
231	} else {
232	pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number);
233	if (pindesc->name == NULL)
234	return -ENOMEM;
235	pindesc->dynamic_name = true;
236	}
237
238	radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc);
239	pr_debug("registered pin %d (%s) on %s\n",
240	number, pindesc->name, pctldev->desc->name);
241	return 0;
242	}
243
244	static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
245	struct pinctrl_pin_desc const *pins,
246	unsigned num_descs)
247	{
248	unsigned i;
249	int ret = 0;
250
251	for (i = 0; i < num_descs; i++) {
252	ret = pinctrl_register_one_pin(pctldev,
253	pins[i].number, pins[i].name);
254	if (ret)
255	return ret;
256	}
257
258	return 0;
259	}
260
261	/**
262	* pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
263	* @pctldev: pin controller device to check
264	* @gpio: gpio pin to check taken from the global GPIO pin space
265	*
266	* Tries to match a GPIO pin number to the ranges handled by a certain pin
267	* controller, return the range or NULL
268	*/
269	static struct pinctrl_gpio_range *
270	pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
271	{
272	struct pinctrl_gpio_range *range = NULL;
273
274	/* Loop over the ranges */
275	list_for_each_entry(range, &pctldev->gpio_ranges, node) {
276	/* Check if we're in the valid range */
277	if (gpio >= range->base &&
278	gpio < range->base + range->npins) {
279	return range;
280	}
281	}
282
283	return NULL;
284	}
285
286	/**
287	* pinctrl_get_device_gpio_range() - find device for GPIO range
288	* @gpio: the pin to locate the pin controller for
289	* @outdev: the pin control device if found
290	* @outrange: the GPIO range if found
291	*
292	* Find the pin controller handling a certain GPIO pin from the pinspace of
293	* the GPIO subsystem, return the device and the matching GPIO range. Returns
294	* -EPROBE_DEFER if the GPIO range could not be found in any device since it
295	* may still have not been registered.
296	*/
297	static int pinctrl_get_device_gpio_range(unsigned gpio,
298	struct pinctrl_dev **outdev,
299	struct pinctrl_gpio_range **outrange)
300	{
301	struct pinctrl_dev *pctldev = NULL;
302
303	/* Loop over the pin controllers */
304	list_for_each_entry(pctldev, &pinctrldev_list, node) {
305	struct pinctrl_gpio_range *range;
306
307	range = pinctrl_match_gpio_range(pctldev, gpio);
308	if (range != NULL) {
309	*outdev = pctldev;
310	*outrange = range;
311	return 0;
312	}
313	}
314
315	return -EPROBE_DEFER;
316	}
317
318	/**
319	* pinctrl_add_gpio_range() - register a GPIO range for a controller
320	* @pctldev: pin controller device to add the range to
321	* @range: the GPIO range to add
322	*
323	* This adds a range of GPIOs to be handled by a certain pin controller. Call
324	* this to register handled ranges after registering your pin controller.
325	*/
326	void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
327	struct pinctrl_gpio_range *range)
328	{
329	mutex_lock(&pinctrl_mutex);
330	list_add_tail(&range->node, &pctldev->gpio_ranges);
331	mutex_unlock(&pinctrl_mutex);
332	}
333	EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
334
335	void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
336	struct pinctrl_gpio_range *ranges,
337	unsigned nranges)
338	{
339	int i;
340
341	for (i = 0; i < nranges; i++)
342	pinctrl_add_gpio_range(pctldev, &ranges[i]);
343	}
344	EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges);
345
346	/**
347	* pinctrl_get_group_selector() - returns the group selector for a group
348	* @pctldev: the pin controller handling the group
349	* @pin_group: the pin group to look up
350	*/
351	int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
352	const char *pin_group)
353	{
354	const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
355	unsigned ngroups = pctlops->get_groups_count(pctldev);
356	unsigned group_selector = 0;
357
358	while (group_selector < ngroups) {
359	const char *gname = pctlops->get_group_name(pctldev,
360	group_selector);
361	if (!strcmp(gname, pin_group)) {
362	dev_dbg(pctldev->dev,
363	"found group selector %u for %s\n",
364	group_selector,
365	pin_group);
366	return group_selector;
367	}
368
369	group_selector++;
370	}
371
372	dev_err(pctldev->dev, "does not have pin group %s\n",
373	pin_group);
374
375	return -EINVAL;
376	}
377
378	/**
379	* pinctrl_request_gpio() - request a single pin to be used in as GPIO
380	* @gpio: the GPIO pin number from the GPIO subsystem number space
381	*
382	* This function should ONLY be used from gpiolib-based GPIO drivers,
383	* as part of their gpio_request() semantics, platforms and individual drivers
384	* shall NOT request GPIO pins to be muxed in.
385	*/
386	int pinctrl_request_gpio(unsigned gpio)
387	{
388	struct pinctrl_dev *pctldev;
389	struct pinctrl_gpio_range *range;
390	int ret;
391	int pin;
392
393	mutex_lock(&pinctrl_mutex);
394
395	ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
396	if (ret) {
397	mutex_unlock(&pinctrl_mutex);
398	return ret;
399	}
400
401	/* Convert to the pin controllers number space */
402	pin = gpio - range->base + range->pin_base;
403
404	ret = pinmux_request_gpio(pctldev, range, pin, gpio);
405
406	mutex_unlock(&pinctrl_mutex);
407	return ret;
408	}
409	EXPORT_SYMBOL_GPL(pinctrl_request_gpio);
410
411	/**
412	* pinctrl_free_gpio() - free control on a single pin, currently used as GPIO
413	* @gpio: the GPIO pin number from the GPIO subsystem number space
414	*
415	* This function should ONLY be used from gpiolib-based GPIO drivers,
416	* as part of their gpio_free() semantics, platforms and individual drivers
417	* shall NOT request GPIO pins to be muxed out.
418	*/
419	void pinctrl_free_gpio(unsigned gpio)
420	{
421	struct pinctrl_dev *pctldev;
422	struct pinctrl_gpio_range *range;
423	int ret;
424	int pin;
425
426	mutex_lock(&pinctrl_mutex);
427
428	ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
429	if (ret) {
430	mutex_unlock(&pinctrl_mutex);
431	return;
432	}
433
434	/* Convert to the pin controllers number space */
435	pin = gpio - range->base + range->pin_base;
436
437	pinmux_free_gpio(pctldev, pin, range);
438
439	mutex_unlock(&pinctrl_mutex);
440	}
441	EXPORT_SYMBOL_GPL(pinctrl_free_gpio);
442
443	static int pinctrl_gpio_direction(unsigned gpio, bool input)
444	{
445	struct pinctrl_dev *pctldev;
446	struct pinctrl_gpio_range *range;
447	int ret;
448	int pin;
449
450	ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
451	if (ret)
452	return ret;
453
454	/* Convert to the pin controllers number space */
455	pin = gpio - range->base + range->pin_base;
456
457	return pinmux_gpio_direction(pctldev, range, pin, input);
458	}
459
460	/**
461	* pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode
462	* @gpio: the GPIO pin number from the GPIO subsystem number space
463	*
464	* This function should ONLY be used from gpiolib-based GPIO drivers,
465	* as part of their gpio_direction_input() semantics, platforms and individual
466	* drivers shall NOT touch pin control GPIO calls.
467	*/
468	int pinctrl_gpio_direction_input(unsigned gpio)
469	{
470	int ret;
471	mutex_lock(&pinctrl_mutex);
472	ret = pinctrl_gpio_direction(gpio, true);
473	mutex_unlock(&pinctrl_mutex);
474	return ret;
475	}
476	EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
477
478	/**
479	* pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode
480	* @gpio: the GPIO pin number from the GPIO subsystem number space
481	*
482	* This function should ONLY be used from gpiolib-based GPIO drivers,
483	* as part of their gpio_direction_output() semantics, platforms and individual
484	* drivers shall NOT touch pin control GPIO calls.
485	*/
486	int pinctrl_gpio_direction_output(unsigned gpio)
487	{
488	int ret;
489	mutex_lock(&pinctrl_mutex);
490	ret = pinctrl_gpio_direction(gpio, false);
491	mutex_unlock(&pinctrl_mutex);
492	return ret;
493	}
494	EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
495
496	static struct pinctrl_state find_state(struct pinctrl p,
497	const char *name)
498	{
499	struct pinctrl_state *state;
500
501	list_for_each_entry(state, &p->states, node)
502	if (!strcmp(state->name, name))
503	return state;
504
505	return NULL;
506	}
507
508	static struct pinctrl_state create_state(struct pinctrl p,
509	const char *name)
510	{
511	struct pinctrl_state *state;
512
513	state = kzalloc(sizeof(*state), GFP_KERNEL);
514	if (state == NULL) {
515	dev_err(p->dev,
516	"failed to alloc struct pinctrl_state\n");
517	return ERR_PTR(-ENOMEM);
518	}
519
520	state->name = name;
521	INIT_LIST_HEAD(&state->settings);
522
523	list_add_tail(&state->node, &p->states);
524
525	return state;
526	}
527
528	static int add_setting(struct pinctrl p, struct pinctrl_map const map)
529	{
530	struct pinctrl_state *state;
531	struct pinctrl_setting *setting;
532	int ret;
533
534	state = find_state(p, map->name);
535	if (!state)
536	state = create_state(p, map->name);
537	if (IS_ERR(state))
538	return PTR_ERR(state);
539
540	if (map->type == PIN_MAP_TYPE_DUMMY_STATE)
541	return 0;
542
543	setting = kzalloc(sizeof(*setting), GFP_KERNEL);
544	if (setting == NULL) {
545	dev_err(p->dev,
546	"failed to alloc struct pinctrl_setting\n");
547	return -ENOMEM;
548	}
549
550	setting->type = map->type;
551
552	setting->pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
553	if (setting->pctldev == NULL) {
554	dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe",
555	map->ctrl_dev_name);
556	kfree(setting);
557	/*
558	* OK let us guess that the driver is not there yet, and
559	* let's defer obtaining this pinctrl handle to later...
560	*/
561	return -EPROBE_DEFER;
562	}
563
564	switch (map->type) {
565	case PIN_MAP_TYPE_MUX_GROUP:
566	ret = pinmux_map_to_setting(map, setting);
567	break;
568	case PIN_MAP_TYPE_CONFIGS_PIN:
569	case PIN_MAP_TYPE_CONFIGS_GROUP:
570	ret = pinconf_map_to_setting(map, setting);
571	break;
572	default:
573	ret = -EINVAL;
574	break;
575	}
576	if (ret < 0) {
577	kfree(setting);
578	return ret;
579	}
580
581	list_add_tail(&setting->node, &state->settings);
582
583	return 0;
584	}
585
586	static struct pinctrl find_pinctrl(struct device dev)
587	{
588	struct pinctrl *p;
589
590	list_for_each_entry(p, &pinctrl_list, node)
591	if (p->dev == dev)
592	return p;
593
594	return NULL;
595	}
596
597	static void pinctrl_put_locked(struct pinctrl *p, bool inlist);
598
599	static struct pinctrl create_pinctrl(struct device dev)
600	{
601	struct pinctrl *p;
602	const char *devname;
603	struct pinctrl_maps *maps_node;
604	int i;
605	struct pinctrl_map const *map;
606	int ret;
607
608	/*
609	* create the state cookie holder struct pinctrl for each
610	* mapping, this is what consumers will get when requesting
611	* a pin control handle with pinctrl_get()
612	*/
613	p = kzalloc(sizeof(*p), GFP_KERNEL);
614	if (p == NULL) {
615	dev_err(dev, "failed to alloc struct pinctrl\n");
616	return ERR_PTR(-ENOMEM);
617	}
618	p->dev = dev;
619	INIT_LIST_HEAD(&p->states);
620	INIT_LIST_HEAD(&p->dt_maps);
621
622	ret = pinctrl_dt_to_map(p);
623	if (ret < 0) {
624	kfree(p);
625	return ERR_PTR(ret);
626	}
627
628	devname = dev_name(dev);
629
630	/* Iterate over the pin control maps to locate the right ones */
631	for_each_maps(maps_node, i, map) {
632	/* Map must be for this device */
633	if (strcmp(map->dev_name, devname))
634	continue;
635
636	ret = add_setting(p, map);
637	if (ret < 0) {
638	pinctrl_put_locked(p, false);
639	return ERR_PTR(ret);
640	}
641	}
642
643	/* Add the pinmux to the global list */
644	list_add_tail(&p->node, &pinctrl_list);
645
646	return p;
647	}
648
649	static struct pinctrl pinctrl_get_locked(struct device dev)
650	{
651	struct pinctrl *p;
652
653	if (WARN_ON(!dev))
654	return ERR_PTR(-EINVAL);
655
656	p = find_pinctrl(dev);
657	if (p != NULL)
658	return ERR_PTR(-EBUSY);
659
660	return create_pinctrl(dev);
661	}
662
663	/**
664	* pinctrl_get() - retrieves the pinctrl handle for a device
665	* @dev: the device to obtain the handle for
666	*/
667	struct pinctrl pinctrl_get(struct device dev)
668	{
669	struct pinctrl *p;
670
671	mutex_lock(&pinctrl_mutex);
672	p = pinctrl_get_locked(dev);
673	mutex_unlock(&pinctrl_mutex);
674
675	return p;
676	}
677	EXPORT_SYMBOL_GPL(pinctrl_get);
678
679	static void pinctrl_put_locked(struct pinctrl *p, bool inlist)
680	{
681	struct pinctrl_state state, n1;
682	struct pinctrl_setting setting, n2;
683
684	list_for_each_entry_safe(state, n1, &p->states, node) {
685	list_for_each_entry_safe(setting, n2, &state->settings, node) {
686	switch (setting->type) {
687	case PIN_MAP_TYPE_MUX_GROUP:
688	if (state == p->state)
689	pinmux_disable_setting(setting);
690	pinmux_free_setting(setting);
691	break;
692	case PIN_MAP_TYPE_CONFIGS_PIN:
693	case PIN_MAP_TYPE_CONFIGS_GROUP:
694	pinconf_free_setting(setting);
695	break;
696	default:
697	break;
698	}
699	list_del(&setting->node);
700	kfree(setting);
701	}
702	list_del(&state->node);
703	kfree(state);
704	}
705
706	pinctrl_dt_free_maps(p);
707
708	if (inlist)
709	list_del(&p->node);
710	kfree(p);
711	}
712
713	/**
714	* pinctrl_put() - release a previously claimed pinctrl handle
715	* @p: the pinctrl handle to release
716	*/
717	void pinctrl_put(struct pinctrl *p)
718	{
719	mutex_lock(&pinctrl_mutex);
720	pinctrl_put_locked(p, true);
721	mutex_unlock(&pinctrl_mutex);
722	}
723	EXPORT_SYMBOL_GPL(pinctrl_put);
724
725	static struct pinctrl_state pinctrl_lookup_state_locked(struct pinctrl p,
726	const char *name)
727	{
728	struct pinctrl_state *state;
729
730	state = find_state(p, name);
731	if (!state) {
732	if (pinctrl_dummy_state) {
733	/* create dummy state */
734	dev_dbg(p->dev, "using pinctrl dummy state (%s)\n",
735	name);
736	state = create_state(p, name);
737	} else
738	state = ERR_PTR(-ENODEV);
739	}
740
741	return state;
742	}
743
744	/**
745	* pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle
746	* @p: the pinctrl handle to retrieve the state from
747	* @name: the state name to retrieve
748	*/
749	struct pinctrl_state pinctrl_lookup_state(struct pinctrl p, const char *name)
750	{
751	struct pinctrl_state *s;
752
753	mutex_lock(&pinctrl_mutex);
754	s = pinctrl_lookup_state_locked(p, name);
755	mutex_unlock(&pinctrl_mutex);
756
757	return s;
758	}
759	EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
760
761	static int pinctrl_select_state_locked(struct pinctrl *p,
762	struct pinctrl_state *state)
763	{
764	struct pinctrl_setting setting, setting2;
765	int ret;
766
767	if (p->state == state)
768	return 0;
769
770	if (p->state) {
771	/*
772	* The set of groups with a mux configuration in the old state
773	* may not be identical to the set of groups with a mux setting
774	* in the new state. While this might be unusual, it's entirely
775	* possible for the "user"-supplied mapping table to be written
776	* that way. For each group that was configured in the old state
777	* but not in the new state, this code puts that group into a
778	* safe/disabled state.
779	*/
780	list_for_each_entry(setting, &p->state->settings, node) {
781	bool found = false;
782	if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
783	continue;
784	list_for_each_entry(setting2, &state->settings, node) {
785	if (setting2->type != PIN_MAP_TYPE_MUX_GROUP)
786	continue;
787	if (setting2->data.mux.group ==
788	setting->data.mux.group) {
789	found = true;
790	break;
791	}
792	}
793	if (!found)
794	pinmux_disable_setting(setting);
795	}
796	}
797
798	p->state = state;
799
800	/* Apply all the settings for the new state */
801	list_for_each_entry(setting, &state->settings, node) {
802	switch (setting->type) {
803	case PIN_MAP_TYPE_MUX_GROUP:
804	ret = pinmux_enable_setting(setting);
805	break;
806	case PIN_MAP_TYPE_CONFIGS_PIN:
807	case PIN_MAP_TYPE_CONFIGS_GROUP:
808	ret = pinconf_apply_setting(setting);
809	break;
810	default:
811	ret = -EINVAL;
812	break;
813	}
814	if (ret < 0) {
815	/* FIXME: Difficult to return to prev state */
816	return ret;
817	}
818	}
819
820	return 0;
821	}
822
823	/**
824	* pinctrl_select() - select/activate/program a pinctrl state to HW
825	* @p: the pinctrl handle for the device that requests configuratio
826	* @state: the state handle to select/activate/program
827	*/
828	int pinctrl_select_state(struct pinctrl p, struct pinctrl_state state)
829	{
830	int ret;
831
832	mutex_lock(&pinctrl_mutex);
833	ret = pinctrl_select_state_locked(p, state);
834	mutex_unlock(&pinctrl_mutex);
835
836	return ret;
837	}
838	EXPORT_SYMBOL_GPL(pinctrl_select_state);
839
840	static void devm_pinctrl_release(struct device dev, void res)
841	{
842	pinctrl_put((struct pinctrl *)res);
843	}
844
845	/**
846	* struct devm_pinctrl_get() - Resource managed pinctrl_get()
847	* @dev: the device to obtain the handle for
848	*
849	* If there is a need to explicitly destroy the returned struct pinctrl,
850	* devm_pinctrl_put() should be used, rather than plain pinctrl_put().
851	*/
852	struct pinctrl devm_pinctrl_get(struct device dev)
853	{
854	struct pinctrl *ptr, p;
855
856	ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL);
857	if (!ptr)
858	return ERR_PTR(-ENOMEM);
859
860	p = pinctrl_get(dev);
861	if (!IS_ERR(p)) {
862	*ptr = p;
863	devres_add(dev, ptr);
864	} else {
865	devres_free(ptr);
866	}
867
868	return p;
869	}
870	EXPORT_SYMBOL_GPL(devm_pinctrl_get);
871
872	static int devm_pinctrl_match(struct device dev, void res, void *data)
873	{
874	struct pinctrl **p = res;
875
876	return *p == data;
877	}
878
879	/**
880	* devm_pinctrl_put() - Resource managed pinctrl_put()
881	* @p: the pinctrl handle to release
882	*
883	* Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally
884	* this function will not need to be called and the resource management
885	* code will ensure that the resource is freed.
886	*/
887	void devm_pinctrl_put(struct pinctrl *p)
888	{
889	WARN_ON(devres_destroy(p->dev, devm_pinctrl_release,
890	devm_pinctrl_match, p));
891	pinctrl_put(p);
892	}
893	EXPORT_SYMBOL_GPL(devm_pinctrl_put);
894
895	int pinctrl_register_map(struct pinctrl_map const *maps, unsigned num_maps,
896	bool dup, bool locked)
897	{
898	int i, ret;
899	struct pinctrl_maps *maps_node;
900
901	pr_debug("add %d pinmux maps\n", num_maps);
902
903	/* First sanity check the new mapping */
904	for (i = 0; i < num_maps; i++) {
905	if (!maps[i].dev_name) {
906	pr_err("failed to register map %s (%d): no device given\n",
907	maps[i].name, i);
908	return -EINVAL;
909	}
910
911	if (!maps[i].name) {
912	pr_err("failed to register map %d: no map name given\n",
913	i);
914	return -EINVAL;
915	}
916
917	if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE &&
918	!maps[i].ctrl_dev_name) {
919	pr_err("failed to register map %s (%d): no pin control device given\n",
920	maps[i].name, i);
921	return -EINVAL;
922	}
923
924	switch (maps[i].type) {
925	case PIN_MAP_TYPE_DUMMY_STATE:
926	break;
927	case PIN_MAP_TYPE_MUX_GROUP:
928	ret = pinmux_validate_map(&maps[i], i);
929	if (ret < 0)
930	return ret;
931	break;
932	case PIN_MAP_TYPE_CONFIGS_PIN:
933	case PIN_MAP_TYPE_CONFIGS_GROUP:
934	ret = pinconf_validate_map(&maps[i], i);
935	if (ret < 0)
936	return ret;
937	break;
938	default:
939	pr_err("failed to register map %s (%d): invalid type given\n",
940	maps[i].name, i);
941	return -EINVAL;
942	}
943	}
944
945	maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL);
946	if (!maps_node) {
947	pr_err("failed to alloc struct pinctrl_maps\n");
948	return -ENOMEM;
949	}
950
951	maps_node->num_maps = num_maps;
952	if (dup) {
953	maps_node->maps = kmemdup(maps, sizeof(maps) num_maps,
954	GFP_KERNEL);
955	if (!maps_node->maps) {
956	pr_err("failed to duplicate mapping table\n");
957	kfree(maps_node);
958	return -ENOMEM;
959	}
960	} else {
961	maps_node->maps = maps;
962	}
963
964	if (!locked)
965	mutex_lock(&pinctrl_mutex);
966	list_add_tail(&maps_node->node, &pinctrl_maps);
967	if (!locked)
968	mutex_unlock(&pinctrl_mutex);
969
970	return 0;
971	}
972
973	/**
974	* pinctrl_register_mappings() - register a set of pin controller mappings
975	* @maps: the pincontrol mappings table to register. This should probably be
976	* marked with __initdata so it can be discarded after boot. This
977	* function will perform a shallow copy for the mapping entries.
978	* @num_maps: the number of maps in the mapping table
979	*/
980	int pinctrl_register_mappings(struct pinctrl_map const *maps,
981	unsigned num_maps)
982	{
983	return pinctrl_register_map(maps, num_maps, true, false);
984	}
985
986	void pinctrl_unregister_map(struct pinctrl_map const *map)
987	{
988	struct pinctrl_maps *maps_node;
989
990	list_for_each_entry(maps_node, &pinctrl_maps, node) {
991	if (maps_node->maps == map) {
992	list_del(&maps_node->node);
993	return;
994	}
995	}
996	}
997
998	#ifdef CONFIG_DEBUG_FS
999
1000	static int pinctrl_pins_show(struct seq_file s, void what)
1001	{
1002	struct pinctrl_dev *pctldev = s->private;
1003	const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1004	unsigned i, pin;
1005
1006	seq_printf(s, "registered pins: %d\n", pctldev->desc->npins);
1007
1008	mutex_lock(&pinctrl_mutex);
1009
1010	/* The pin number can be retrived from the pin controller descriptor */
1011	for (i = 0; i < pctldev->desc->npins; i++) {
1012	struct pin_desc *desc;
1013
1014	pin = pctldev->desc->pins[i].number;
1015	desc = pin_desc_get(pctldev, pin);
1016	/* Pin space may be sparse */
1017	if (desc == NULL)
1018	continue;
1019
1020	seq_printf(s, "pin %d (%s) ", pin,
1021	desc->name ? desc->name : "unnamed");
1022
1023	/* Driver-specific info per pin */
1024	if (ops->pin_dbg_show)
1025	ops->pin_dbg_show(pctldev, s, pin);
1026
1027	seq_puts(s, "\n");
1028	}
1029
1030	mutex_unlock(&pinctrl_mutex);
1031
1032	return 0;
1033	}
1034
1035	static int pinctrl_groups_show(struct seq_file s, void what)
1036	{
1037	struct pinctrl_dev *pctldev = s->private;
1038	const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1039	unsigned ngroups, selector = 0;
1040
1041	ngroups = ops->get_groups_count(pctldev);
1042	mutex_lock(&pinctrl_mutex);
1043
1044	seq_puts(s, "registered pin groups:\n");
1045	while (selector < ngroups) {
1046	const unsigned *pins;
1047	unsigned num_pins;
1048	const char *gname = ops->get_group_name(pctldev, selector);
1049	const char *pname;
1050	int ret;
1051	int i;
1052
1053	ret = ops->get_group_pins(pctldev, selector,
1054	&pins, &num_pins);
1055	if (ret)
1056	seq_printf(s, "%s [ERROR GETTING PINS]\n",
1057	gname);
1058	else {
1059	seq_printf(s, "group: %s\n", gname);
1060	for (i = 0; i < num_pins; i++) {
1061	pname = pin_get_name(pctldev, pins[i]);
1062	if (WARN_ON(!pname))
1063	return -EINVAL;
1064	seq_printf(s, "pin %d (%s)\n", pins[i], pname);
1065	}
1066	seq_puts(s, "\n");
1067	}
1068	selector++;
1069	}
1070
1071	mutex_unlock(&pinctrl_mutex);
1072
1073	return 0;
1074	}
1075
1076	static int pinctrl_gpioranges_show(struct seq_file s, void what)
1077	{
1078	struct pinctrl_dev *pctldev = s->private;
1079	struct pinctrl_gpio_range *range = NULL;
1080
1081	seq_puts(s, "GPIO ranges handled:\n");
1082
1083	mutex_lock(&pinctrl_mutex);
1084
1085	/* Loop over the ranges */
1086	list_for_each_entry(range, &pctldev->gpio_ranges, node) {
1087	seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n",
1088	range->id, range->name,
1089	range->base, (range->base + range->npins - 1),
1090	range->pin_base,
1091	(range->pin_base + range->npins - 1));
1092	}
1093
1094	mutex_unlock(&pinctrl_mutex);
1095
1096	return 0;
1097	}
1098
1099	static int pinctrl_devices_show(struct seq_file s, void what)
1100	{
1101	struct pinctrl_dev *pctldev;
1102
1103	seq_puts(s, "name [pinmux] [pinconf]\n");
1104
1105	mutex_lock(&pinctrl_mutex);
1106
1107	list_for_each_entry(pctldev, &pinctrldev_list, node) {
1108	seq_printf(s, "%s ", pctldev->desc->name);
1109	if (pctldev->desc->pmxops)
1110	seq_puts(s, "yes ");
1111	else
1112	seq_puts(s, "no ");
1113	if (pctldev->desc->confops)
1114	seq_puts(s, "yes");
1115	else
1116	seq_puts(s, "no");
1117	seq_puts(s, "\n");
1118	}
1119
1120	mutex_unlock(&pinctrl_mutex);
1121
1122	return 0;
1123	}
1124
1125	static inline const char *map_type(enum pinctrl_map_type type)
1126	{
1127	static const char * const names[] = {
1128	"INVALID",
1129	"DUMMY_STATE",
1130	"MUX_GROUP",
1131	"CONFIGS_PIN",
1132	"CONFIGS_GROUP",
1133	};
1134
1135	if (type >= ARRAY_SIZE(names))
1136	return "UNKNOWN";
1137
1138	return names[type];
1139	}
1140
1141	static int pinctrl_maps_show(struct seq_file s, void what)
1142	{
1143	struct pinctrl_maps *maps_node;
1144	int i;
1145	struct pinctrl_map const *map;
1146
1147	seq_puts(s, "Pinctrl maps:\n");
1148
1149	mutex_lock(&pinctrl_mutex);
1150
1151	for_each_maps(maps_node, i, map) {
1152	seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n",
1153	map->dev_name, map->name, map_type(map->type),
1154	map->type);
1155
1156	if (map->type != PIN_MAP_TYPE_DUMMY_STATE)
1157	seq_printf(s, "controlling device %s\n",
1158	map->ctrl_dev_name);
1159
1160	switch (map->type) {
1161	case PIN_MAP_TYPE_MUX_GROUP:
1162	pinmux_show_map(s, map);
1163	break;
1164	case PIN_MAP_TYPE_CONFIGS_PIN:
1165	case PIN_MAP_TYPE_CONFIGS_GROUP:
1166	pinconf_show_map(s, map);
1167	break;
1168	default:
1169	break;
1170	}
1171
1172	seq_printf(s, "\n");
1173	}
1174
1175	mutex_unlock(&pinctrl_mutex);
1176
1177	return 0;
1178	}
1179
1180	static int pinctrl_show(struct seq_file s, void what)
1181	{
1182	struct pinctrl *p;
1183	struct pinctrl_state *state;
1184	struct pinctrl_setting *setting;
1185
1186	seq_puts(s, "Requested pin control handlers their pinmux maps:\n");
1187
1188	mutex_lock(&pinctrl_mutex);
1189
1190	list_for_each_entry(p, &pinctrl_list, node) {
1191	seq_printf(s, "device: %s current state: %s\n",
1192	dev_name(p->dev),
1193	p->state ? p->state->name : "none");
1194
1195	list_for_each_entry(state, &p->states, node) {
1196	seq_printf(s, " state: %s\n", state->name);
1197
1198	list_for_each_entry(setting, &state->settings, node) {
1199	struct pinctrl_dev *pctldev = setting->pctldev;
1200
1201	seq_printf(s, " type: %s controller %s ",
1202	map_type(setting->type),
1203	pinctrl_dev_get_name(pctldev));
1204
1205	switch (setting->type) {
1206	case PIN_MAP_TYPE_MUX_GROUP:
1207	pinmux_show_setting(s, setting);
1208	break;
1209	case PIN_MAP_TYPE_CONFIGS_PIN:
1210	case PIN_MAP_TYPE_CONFIGS_GROUP:
1211	pinconf_show_setting(s, setting);
1212	break;
1213	default:
1214	break;
1215	}
1216	}
1217	}
1218	}
1219
1220	mutex_unlock(&pinctrl_mutex);
1221
1222	return 0;
1223	}
1224
1225	static int pinctrl_pins_open(struct inode inode, struct file file)
1226	{
1227	return single_open(file, pinctrl_pins_show, inode->i_private);
1228	}
1229
1230	static int pinctrl_groups_open(struct inode inode, struct file file)
1231	{
1232	return single_open(file, pinctrl_groups_show, inode->i_private);
1233	}
1234
1235	static int pinctrl_gpioranges_open(struct inode inode, struct file file)
1236	{
1237	return single_open(file, pinctrl_gpioranges_show, inode->i_private);
1238	}
1239
1240	static int pinctrl_devices_open(struct inode inode, struct file file)
1241	{
1242	return single_open(file, pinctrl_devices_show, NULL);
1243	}
1244
1245	static int pinctrl_maps_open(struct inode inode, struct file file)
1246	{
1247	return single_open(file, pinctrl_maps_show, NULL);
1248	}
1249
1250	static int pinctrl_open(struct inode inode, struct file file)
1251	{
1252	return single_open(file, pinctrl_show, NULL);
1253	}
1254
1255	static const struct file_operations pinctrl_pins_ops = {
1256	.open = pinctrl_pins_open,
1257	.read = seq_read,
1258	.llseek = seq_lseek,
1259	.release = single_release,
1260	};
1261
1262	static const struct file_operations pinctrl_groups_ops = {
1263	.open = pinctrl_groups_open,
1264	.read = seq_read,
1265	.llseek = seq_lseek,
1266	.release = single_release,
1267	};
1268
1269	static const struct file_operations pinctrl_gpioranges_ops = {
1270	.open = pinctrl_gpioranges_open,
1271	.read = seq_read,
1272	.llseek = seq_lseek,
1273	.release = single_release,
1274	};
1275
1276	static const struct file_operations pinctrl_devices_ops = {
1277	.open = pinctrl_devices_open,
1278	.read = seq_read,
1279	.llseek = seq_lseek,
1280	.release = single_release,
1281	};
1282
1283	static const struct file_operations pinctrl_maps_ops = {
1284	.open = pinctrl_maps_open,
1285	.read = seq_read,
1286	.llseek = seq_lseek,
1287	.release = single_release,
1288	};
1289
1290	static const struct file_operations pinctrl_ops = {
1291	.open = pinctrl_open,
1292	.read = seq_read,
1293	.llseek = seq_lseek,
1294	.release = single_release,
1295	};
1296
1297	static struct dentry *debugfs_root;
1298
1299	static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1300	{
1301	struct dentry *device_root;
1302
1303	device_root = debugfs_create_dir(dev_name(pctldev->dev),
1304	debugfs_root);
1305	pctldev->device_root = device_root;
1306
1307	if (IS_ERR(device_root) \|\| !device_root) {
1308	pr_warn("failed to create debugfs directory for %s\n",
1309	dev_name(pctldev->dev));
1310	return;
1311	}
1312	debugfs_create_file("pins", S_IFREG \| S_IRUGO,
1313	device_root, pctldev, &pinctrl_pins_ops);
1314	debugfs_create_file("pingroups", S_IFREG \| S_IRUGO,
1315	device_root, pctldev, &pinctrl_groups_ops);
1316	debugfs_create_file("gpio-ranges", S_IFREG \| S_IRUGO,
1317	device_root, pctldev, &pinctrl_gpioranges_ops);
1318	pinmux_init_device_debugfs(device_root, pctldev);
1319	pinconf_init_device_debugfs(device_root, pctldev);
1320	}
1321
1322	static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1323	{
1324	debugfs_remove_recursive(pctldev->device_root);
1325	}
1326
1327	static void pinctrl_init_debugfs(void)
1328	{
1329	debugfs_root = debugfs_create_dir("pinctrl", NULL);
1330	if (IS_ERR(debugfs_root) \|\| !debugfs_root) {
1331	pr_warn("failed to create debugfs directory\n");
1332	debugfs_root = NULL;
1333	return;
1334	}
1335
1336	debugfs_create_file("pinctrl-devices", S_IFREG \| S_IRUGO,
1337	debugfs_root, NULL, &pinctrl_devices_ops);
1338	debugfs_create_file("pinctrl-maps", S_IFREG \| S_IRUGO,
1339	debugfs_root, NULL, &pinctrl_maps_ops);
1340	debugfs_create_file("pinctrl-handles", S_IFREG \| S_IRUGO,
1341	debugfs_root, NULL, &pinctrl_ops);
1342	}
1343
1344	#else /* CONFIG_DEBUG_FS */
1345
1346	static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
1347	{
1348	}
1349
1350	static void pinctrl_init_debugfs(void)
1351	{
1352	}
1353
1354	static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
1355	{
1356	}
1357
1358	#endif
1359
1360	static int pinctrl_check_ops(struct pinctrl_dev *pctldev)
1361	{
1362	const struct pinctrl_ops *ops = pctldev->desc->pctlops;
1363
1364	if (!ops \|\|
1365	!ops->get_groups_count \|\|
1366	!ops->get_group_name \|\|
1367	!ops->get_group_pins)
1368	return -EINVAL;
1369
1370	if (ops->dt_node_to_map && !ops->dt_free_map)
1371	return -EINVAL;
1372
1373	return 0;
1374	}
1375
1376	/**
1377	* pinctrl_register() - register a pin controller device
1378	* @pctldesc: descriptor for this pin controller
1379	* @dev: parent device for this pin controller
1380	* @driver_data: private pin controller data for this pin controller
1381	*/
1382	struct pinctrl_dev pinctrl_register(struct pinctrl_desc pctldesc,
1383	struct device dev, void driver_data)
1384	{
1385	struct pinctrl_dev *pctldev;
1386	int ret;
1387
1388	if (!pctldesc)
1389	return NULL;
1390	if (!pctldesc->name)
1391	return NULL;
1392
1393	pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL);
1394	if (pctldev == NULL) {
1395	dev_err(dev, "failed to alloc struct pinctrl_dev\n");
1396	return NULL;
1397	}
1398
1399	/* Initialize pin control device struct */
1400	pctldev->owner = pctldesc->owner;
1401	pctldev->desc = pctldesc;
1402	pctldev->driver_data = driver_data;
1403	INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
1404	INIT_LIST_HEAD(&pctldev->gpio_ranges);
1405	pctldev->dev = dev;
1406
1407	/* check core ops for sanity */
1408	if (pinctrl_check_ops(pctldev)) {
1409	dev_err(dev, "pinctrl ops lacks necessary functions\n");
1410	goto out_err;
1411	}
1412
1413	/* If we're implementing pinmuxing, check the ops for sanity */
1414	if (pctldesc->pmxops) {
1415	if (pinmux_check_ops(pctldev))
1416	goto out_err;
1417	}
1418
1419	/* If we're implementing pinconfig, check the ops for sanity */
1420	if (pctldesc->confops) {
1421	if (pinconf_check_ops(pctldev))
1422	goto out_err;
1423	}
1424
1425	/* Register all the pins */
1426	dev_dbg(dev, "try to register %d pins ...\n", pctldesc->npins);
1427	ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins);
1428	if (ret) {
1429	dev_err(dev, "error during pin registration\n");
1430	pinctrl_free_pindescs(pctldev, pctldesc->pins,
1431	pctldesc->npins);
1432	goto out_err;
1433	}
1434
1435	mutex_lock(&pinctrl_mutex);
1436
1437	list_add_tail(&pctldev->node, &pinctrldev_list);
1438
1439	pctldev->p = pinctrl_get_locked(pctldev->dev);
1440	if (!IS_ERR(pctldev->p)) {
1441	struct pinctrl_state *s =
1442	pinctrl_lookup_state_locked(pctldev->p,
1443	PINCTRL_STATE_DEFAULT);
1444	if (IS_ERR(s)) {
1445	dev_dbg(dev, "failed to lookup the default state\n");
1446	} else {
1447	if (pinctrl_select_state_locked(pctldev->p, s))
1448	dev_err(dev,
1449	"failed to select default state\n");
1450	}
1451	}
1452
1453	mutex_unlock(&pinctrl_mutex);
1454
1455	pinctrl_init_device_debugfs(pctldev);
1456
1457	return pctldev;
1458
1459	out_err:
1460	kfree(pctldev);
1461	return NULL;
1462	}
1463	EXPORT_SYMBOL_GPL(pinctrl_register);
1464
1465	/**
1466	* pinctrl_unregister() - unregister pinmux
1467	* @pctldev: pin controller to unregister
1468	*
1469	* Called by pinmux drivers to unregister a pinmux.
1470	*/
1471	void pinctrl_unregister(struct pinctrl_dev *pctldev)
1472	{
1473	struct pinctrl_gpio_range range, n;
1474	if (pctldev == NULL)
1475	return;
1476
1477	pinctrl_remove_device_debugfs(pctldev);
1478
1479	mutex_lock(&pinctrl_mutex);
1480
1481	if (!IS_ERR(pctldev->p))
1482	pinctrl_put_locked(pctldev->p, true);
1483
1484	/* TODO: check that no pinmuxes are still active? */
1485	list_del(&pctldev->node);
1486	/* Destroy descriptor tree */
1487	pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
1488	pctldev->desc->npins);
1489	/* remove gpio ranges map */
1490	list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node)
1491	list_del(&range->node);
1492
1493	kfree(pctldev);
1494
1495	mutex_unlock(&pinctrl_mutex);
1496	}
1497	EXPORT_SYMBOL_GPL(pinctrl_unregister);
1498
1499	static int __init pinctrl_init(void)
1500	{
1501	pr_info("initialized pinctrl subsystem\n");
1502	pinctrl_init_debugfs();
1503	return 0;
1504	}
1505
1506	/* init early since many drivers really need to initialized pinmux early */
1507	core_initcall(pinctrl_init);
1508

Download this file

Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master

Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9

Kernel

Kernel Git Source Tree

Root/drivers/pinctrl/core.c

interactive