// SPDX-License-Identifier: GPL-2.0-only
/*
* Core driver for the pin control subsystem
*
* Copyright ( C ) 2011 - 2012 ST - Ericsson SA
* Written on behalf of Linaro for ST - Ericsson
* Based on bits of regulator core , gpio core and clk core
*
* Author : Linus Walleij < linus . walleij @ linaro . org >
*
* Copyright ( C ) 2012 NVIDIA CORPORATION . All rights reserved .
*/
#define pr_fmt(fmt) "pinctrl core: " fmt
#include <linux/array_size.h>
#include <linux/cleanup.h>
#include <linux/debugfs.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/kref.h>
#include <linux/list.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/gpio.h>
#include <linux/gpio/driver.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/devinfo.h>
#include <linux/pinctrl/machine.h>
#include <linux/pinctrl/pinctrl.h>
#include "core.h"
#include "devicetree.h"
#include "pinconf.h"
#include "pinmux.h"
static bool pinctrl_dummy_state;
/* Mutex taken to protect pinctrl_list */
static DEFINE_MUTEX(pinctrl_list_mutex);
/* Mutex taken to protect pinctrl_maps */
DEFINE_MUTEX(pinctrl_maps_mutex);
/* Mutex taken to protect pinctrldev_list */
static DEFINE_MUTEX(pinctrldev_list_mutex);
/* Global list of pin control devices (struct pinctrl_dev) */
static LIST_HEAD(pinctrldev_list);
/* List of pin controller handles (struct pinctrl) */
static LIST_HEAD(pinctrl_list);
/* List of pinctrl maps (struct pinctrl_maps) */
LIST_HEAD(pinctrl_maps);
/**
* pinctrl_provide_dummies ( ) - indicate if pinctrl provides dummy state support
*
* Usually this function is called by platforms without pinctrl driver support
* but run with some shared drivers using pinctrl APIs .
* After calling this function , the pinctrl core will return successfully
* with creating a dummy state for the driver to keep going smoothly .
*/
void pinctrl_provide_dummies(void )
{
pinctrl_dummy_state = true ;
}
const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev)
{
/* We're not allowed to register devices without name */
return pctldev->desc->name;
}
EXPORT_SYMBOL_GPL(pinctrl_dev_get_name);
const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev)
{
return dev_name(pctldev->dev);
}
EXPORT_SYMBOL_GPL(pinctrl_dev_get_devname);
void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev)
{
return pctldev->driver_data;
}
EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata);
/**
* get_pinctrl_dev_from_devname ( ) - look up pin controller device
* @ devname : the name of a device instance , as returned by dev_name ( )
*
* Looks up a pin control device matching a certain device name or pure device
* pointer , the pure device pointer will take precedence .
*/
struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname)
{
struct pinctrl_dev *pctldev;
if (!devname)
return NULL;
mutex_lock(&pinctrldev_list_mutex);
list_for_each_entry(pctldev, &pinctrldev_list, node) {
if (!strcmp(dev_name(pctldev->dev), devname)) {
/* Matched on device name */
mutex_unlock(&pinctrldev_list_mutex);
return pctldev;
}
}
mutex_unlock(&pinctrldev_list_mutex);
return NULL;
}
struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np)
{
struct pinctrl_dev *pctldev;
mutex_lock(&pinctrldev_list_mutex);
list_for_each_entry(pctldev, &pinctrldev_list, node)
if (device_match_of_node(pctldev->dev, np)) {
mutex_unlock(&pinctrldev_list_mutex);
return pctldev;
}
mutex_unlock(&pinctrldev_list_mutex);
return NULL;
}
/**
* pin_get_from_name ( ) - look up a pin number from a name
* @ pctldev : the pin control device to lookup the pin on
* @ name : the name of the pin to look up
*/
int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name)
{
unsigned int i, pin;
/* The pin number can be retrived from the pin controller descriptor */
for (i = 0 ; i < pctldev->desc->npins; i++) {
struct pin_desc *desc;
pin = pctldev->desc->pins[i].number;
desc = pin_desc_get(pctldev, pin);
/* Pin space may be sparse */
if (desc && !strcmp(name, desc->name))
return pin;
}
return -EINVAL;
}
/**
* pin_get_name ( ) - look up a pin name from a pin id
* @ pctldev : the pin control device to lookup the pin on
* @ pin : pin number / id to look up
*/
const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned int pin)
{
const struct pin_desc *desc;
desc = pin_desc_get(pctldev, pin);
if (!desc) {
dev_err(pctldev->dev, "failed to get pin(%d) name\n" ,
pin);
return NULL;
}
return desc->name;
}
EXPORT_SYMBOL_GPL(pin_get_name);
/* Deletes a range of pin descriptors */
static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev,
const struct pinctrl_pin_desc *pins,
unsigned int num_pins)
{
int i;
for (i = 0 ; i < num_pins; i++) {
struct pin_desc *pindesc;
pindesc = radix_tree_lookup(&pctldev->pin_desc_tree,
pins[i].number);
if (pindesc) {
radix_tree_delete(&pctldev->pin_desc_tree,
pins[i].number);
if (pindesc->dynamic_name)
kfree(pindesc->name);
}
kfree(pindesc);
}
}
static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
const struct pinctrl_pin_desc *pin)
{
struct pin_desc *pindesc;
int error;
pindesc = pin_desc_get(pctldev, pin->number);
if (pindesc) {
dev_err(pctldev->dev, "pin %d already registered\n" ,
pin->number);
return -EINVAL;
}
pindesc = kzalloc(sizeof (*pindesc), GFP_KERNEL);
if (!pindesc)
return -ENOMEM;
/* Set owner */
pindesc->pctldev = pctldev;
#ifdef CONFIG_PINMUX
mutex_init(&pindesc->mux_lock);
#endif
/* Copy basic pin info */
if (pin->name) {
pindesc->name = pin->name;
} else {
pindesc->name = kasprintf(GFP_KERNEL, "PIN%u" , pin->number);
if (!pindesc->name) {
error = -ENOMEM;
goto failed;
}
pindesc->dynamic_name = true ;
}
pindesc->drv_data = pin->drv_data;
error = radix_tree_insert(&pctldev->pin_desc_tree, pin->number, pindesc);
if (error)
goto failed;
pr_debug("registered pin %d (%s) on %s\n" ,
pin->number, pindesc->name, pctldev->desc->name);
return 0 ;
failed:
kfree(pindesc);
return error;
}
static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
const struct pinctrl_pin_desc *pins,
unsigned int num_descs)
{
unsigned int i;
int ret = 0 ;
for (i = 0 ; i < num_descs; i++) {
ret = pinctrl_register_one_pin(pctldev, &pins[i]);
if (ret)
return ret;
}
return 0 ;
}
/**
* gpio_to_pin ( ) - GPIO range GPIO number to pin number translation
* @ range : GPIO range used for the translation
* @ gc : GPIO chip structure from the GPIO subsystem
* @ offset : hardware offset of the GPIO relative to the controller
*
* Finds the pin number for a given GPIO using the specified GPIO range
* as a base for translation . The distinction between linear GPIO ranges
* and pin list based GPIO ranges is managed correctly by this function .
*
* This function assumes the gpio is part of the specified GPIO range , use
* only after making sure this is the case ( e . g . by calling it on the
* result of successful pinctrl_get_device_gpio_range calls ) !
*/
static inline int gpio_to_pin(struct pinctrl_gpio_range *range,
struct gpio_chip *gc, unsigned int offset)
{
unsigned int pin = gc->base + offset - range->base;
if (range->pins)
return range->pins[pin];
else
return range->pin_base + pin;
}
/**
* pinctrl_match_gpio_range ( ) - check if a certain GPIO pin is in range
* @ pctldev : pin controller device to check
* @ gc : GPIO chip structure from the GPIO subsystem
* @ offset : hardware offset of the GPIO relative to the controller
*
* Tries to match a GPIO pin number to the ranges handled by a certain pin
* controller , return the range or NULL
*/
static struct pinctrl_gpio_range *
pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, struct gpio_chip *gc,
unsigned int offset)
{
struct pinctrl_gpio_range *range;
mutex_lock(&pctldev->mutex);
/* Loop over the ranges */
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
/* Check if we're in the valid range */
if ((gc->base + offset) >= range->base &&
(gc->base + offset) < range->base + range->npins) {
mutex_unlock(&pctldev->mutex);
return range;
}
}
mutex_unlock(&pctldev->mutex);
return NULL;
}
/**
* pinctrl_ready_for_gpio_range ( ) - check if other GPIO pins of
* the same GPIO chip are in range
* @ gc : GPIO chip structure from the GPIO subsystem
* @ offset : hardware offset of the GPIO relative to the controller
*
* This function is complement of pinctrl_match_gpio_range ( ) . If the return
* value of pinctrl_match_gpio_range ( ) is NULL , this function could be used
* to check whether pinctrl device is ready or not . Maybe some GPIO pins
* of the same GPIO chip don ' t have back - end pinctrl interface .
* If the return value is true , it means that pinctrl device is ready & the
* certain GPIO pin doesn ' t have back - end pinctrl device . If the return value
* is false , it means that pinctrl device may not be ready .
*/
#ifdef CONFIG_GPIOLIB
static bool pinctrl_ready_for_gpio_range(struct gpio_chip *gc,
unsigned int offset)
{
struct pinctrl_dev *pctldev;
struct pinctrl_gpio_range *range = NULL;
mutex_lock(&pinctrldev_list_mutex);
/* Loop over the pin controllers */
list_for_each_entry(pctldev, &pinctrldev_list, node) {
/* Loop over the ranges */
mutex_lock(&pctldev->mutex);
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
/* Check if any gpio range overlapped with gpio chip */
if (range->base + range->npins - 1 < gc->base ||
range->base > gc->base + gc->ngpio - 1 )
continue ;
mutex_unlock(&pctldev->mutex);
mutex_unlock(&pinctrldev_list_mutex);
return true ;
}
mutex_unlock(&pctldev->mutex);
}
mutex_unlock(&pinctrldev_list_mutex);
return false ;
}
#else
static inline bool
pinctrl_ready_for_gpio_range(struct gpio_chip *gc, unsigned int offset)
{
return true ;
}
#endif
/**
* pinctrl_get_device_gpio_range ( ) - find device for GPIO range
* @ gc : GPIO chip structure from the GPIO subsystem
* @ offset : hardware offset of the GPIO relative to the controller
* @ outdev : the pin control device if found
* @ outrange : the GPIO range if found
*
* Find the pin controller handling a certain GPIO pin from the pinspace of
* the GPIO subsystem , return the device and the matching GPIO range . Returns
* - EPROBE_DEFER if the GPIO range could not be found in any device since it
* may still have not been registered .
*/
static int pinctrl_get_device_gpio_range(struct gpio_chip *gc,
unsigned int offset,
struct pinctrl_dev **outdev,
struct pinctrl_gpio_range **outrange)
{
struct pinctrl_dev *pctldev;
mutex_lock(&pinctrldev_list_mutex);
/* Loop over the pin controllers */
list_for_each_entry(pctldev, &pinctrldev_list, node) {
struct pinctrl_gpio_range *range;
range = pinctrl_match_gpio_range(pctldev, gc, offset);
if (range) {
*outdev = pctldev;
*outrange = range;
mutex_unlock(&pinctrldev_list_mutex);
return 0 ;
}
}
mutex_unlock(&pinctrldev_list_mutex);
return -EPROBE_DEFER;
}
/**
* pinctrl_add_gpio_range ( ) - register a GPIO range for a controller
* @ pctldev : pin controller device to add the range to
* @ range : the GPIO range to add
*
* DEPRECATED : Don ' t use this function in new code . See section 2 of
* Documentation / devicetree / bindings / gpio / gpio . txt on how to bind pinctrl and
* gpio drivers .
*
* This adds a range of GPIOs to be handled by a certain pin controller . Call
* this to register handled ranges after registering your pin controller .
*/
void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range)
{
mutex_lock(&pctldev->mutex);
list_add_tail(&range->node, &pctldev->gpio_ranges);
mutex_unlock(&pctldev->mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *ranges,
unsigned int nranges)
{
int i;
for (i = 0 ; i < nranges; i++)
pinctrl_add_gpio_range(pctldev, &ranges[i]);
}
EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges);
struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
struct pinctrl_gpio_range *range)
{
struct pinctrl_dev *pctldev;
pctldev = get_pinctrl_dev_from_devname(devname);
/*
* If we can ' t find this device , let ' s assume that is because
* it has not probed yet , so the driver trying to register this
* range need to defer probing .
*/
if (!pctldev)
return ERR_PTR(-EPROBE_DEFER);
pinctrl_add_gpio_range(pctldev, range);
return pctldev;
}
EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range);
int pinctrl_get_group_pins(struct pinctrl_dev *pctldev, const char *pin_group,
const unsigned int **pins, unsigned int *num_pins)
{
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
int gs;
if (!pctlops->get_group_pins)
return -EINVAL;
gs = pinctrl_get_group_selector(pctldev, pin_group);
if (gs < 0 )
return gs;
return pctlops->get_group_pins(pctldev, gs, pins, num_pins);
}
EXPORT_SYMBOL_GPL(pinctrl_get_group_pins);
struct pinctrl_gpio_range *
pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev,
unsigned int pin)
{
struct pinctrl_gpio_range *range;
/* Loop over the ranges */
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
/* Check if we're in the valid range */
if (range->pins) {
int a;
for (a = 0 ; a < range->npins; a++) {
if (range->pins[a] == pin)
return range;
}
} else if (pin >= range->pin_base &&
pin < range->pin_base + range->npins)
return range;
}
return NULL;
}
EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin_nolock);
/**
* pinctrl_find_gpio_range_from_pin ( ) - locate the GPIO range for a pin
* @ pctldev : the pin controller device to look in
* @ pin : a controller - local number to find the range for
*/
struct pinctrl_gpio_range *
pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
unsigned int pin)
{
struct pinctrl_gpio_range *range;
mutex_lock(&pctldev->mutex);
range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin);
mutex_unlock(&pctldev->mutex);
return range;
}
EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin);
/**
* pinctrl_remove_gpio_range ( ) - remove a range of GPIOs from a pin controller
* @ pctldev : pin controller device to remove the range from
* @ range : the GPIO range to remove
*/
void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
struct pinctrl_gpio_range *range)
{
mutex_lock(&pctldev->mutex);
list_del(&range->node);
mutex_unlock(&pctldev->mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range);
#ifdef CONFIG_GENERIC_PINCTRL_GROUPS
/**
* pinctrl_generic_get_group_count ( ) - returns the number of pin groups
* @ pctldev : pin controller device
*/
int pinctrl_generic_get_group_count(struct pinctrl_dev *pctldev)
{
return pctldev->num_groups;
}
EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_count);
/**
* pinctrl_generic_get_group_name ( ) - returns the name of a pin group
* @ pctldev : pin controller device
* @ selector : group number
*/
const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev,
unsigned int selector)
{
struct group_desc *group;
group = radix_tree_lookup(&pctldev->pin_group_tree,
selector);
if (!group)
return NULL;
return group->grp.name;
}
EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_name);
/**
* pinctrl_generic_get_group_pins ( ) - gets the pin group pins
* @ pctldev : pin controller device
* @ selector : group number
* @ pins : pins in the group
* @ num_pins : number of pins in the group
*/
int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev,
unsigned int selector,
const unsigned int **pins,
unsigned int *num_pins)
{
struct group_desc *group;
group = radix_tree_lookup(&pctldev->pin_group_tree,
selector);
if (!group) {
dev_err(pctldev->dev, "%s could not find pingroup%i\n" ,
__func__, selector);
return -EINVAL;
}
*pins = group->grp.pins;
*num_pins = group->grp.npins;
return 0 ;
}
EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_pins);
/**
* pinctrl_generic_get_group ( ) - returns a pin group based on the number
* @ pctldev : pin controller device
* @ selector : group number
*/
struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev,
unsigned int selector)
{
struct group_desc *group;
group = radix_tree_lookup(&pctldev->pin_group_tree,
selector);
if (!group)
return NULL;
return group;
}
EXPORT_SYMBOL_GPL(pinctrl_generic_get_group);
static int pinctrl_generic_group_name_to_selector(struct pinctrl_dev *pctldev,
const char *function)
{
const struct pinctrl_ops *ops = pctldev->desc->pctlops;
int ngroups = ops->get_groups_count(pctldev);
int selector = 0 ;
/* See if this pctldev has this group */
while (selector < ngroups) {
const char *gname = ops->get_group_name(pctldev, selector);
if (gname && !strcmp(function, gname))
return selector;
selector++;
}
return -EINVAL;
}
/**
* pinctrl_generic_add_group ( ) - adds a new pin group
* @ pctldev : pin controller device
* @ name : name of the pin group
* @ pins : pins in the pin group
* @ num_pins : number of pins in the pin group
* @ data : pin controller driver specific data
*
* Note that the caller must take care of locking .
*/
int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name,
const unsigned int *pins, int num_pins, void *data)
{
struct group_desc *group;
int selector, error;
if (!name)
return -EINVAL;
selector = pinctrl_generic_group_name_to_selector(pctldev, name);
if (selector >= 0 )
return selector;
selector = pctldev->num_groups;
group = devm_kzalloc(pctldev->dev, sizeof (*group), GFP_KERNEL);
if (!group)
return -ENOMEM;
*group = PINCTRL_GROUP_DESC(name, pins, num_pins, data);
error = radix_tree_insert(&pctldev->pin_group_tree, selector, group);
if (error)
return error;
pctldev->num_groups++;
return selector;
}
EXPORT_SYMBOL_GPL(pinctrl_generic_add_group);
/**
* pinctrl_generic_remove_group ( ) - removes a numbered pin group
* @ pctldev : pin controller device
* @ selector : group number
*
* Note that the caller must take care of locking .
*/
int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev,
unsigned int selector)
{
struct group_desc *group;
group = radix_tree_lookup(&pctldev->pin_group_tree,
selector);
if (!group)
return -ENOENT;
radix_tree_delete(&pctldev->pin_group_tree, selector);
devm_kfree(pctldev->dev, group);
pctldev->num_groups--;
return 0 ;
}
EXPORT_SYMBOL_GPL(pinctrl_generic_remove_group);
/**
* pinctrl_generic_free_groups ( ) - removes all pin groups
* @ pctldev : pin controller device
*
* Note that the caller must take care of locking . The pinctrl groups
* are allocated with devm_kzalloc ( ) so no need to free them here .
*/
static void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev)
{
struct radix_tree_iter iter;
void __rcu **slot;
radix_tree_for_each_slot(slot, &pctldev->pin_group_tree, &iter, 0 )
radix_tree_delete(&pctldev->pin_group_tree, iter.index);
pctldev->num_groups = 0 ;
}
#else
static inline void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev)
{
}
#endif /* CONFIG_GENERIC_PINCTRL_GROUPS */
/**
* pinctrl_get_group_selector ( ) - returns the group selector for a group
* @ pctldev : the pin controller handling the group
* @ pin_group : the pin group to look up
*/
int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
const char *pin_group)
{
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
unsigned int ngroups = pctlops->get_groups_count(pctldev);
unsigned int group_selector = 0 ;
while (group_selector < ngroups) {
const char *gname = pctlops->get_group_name(pctldev,
group_selector);
if (gname && !strcmp(gname, pin_group)) {
dev_dbg(pctldev->dev,
"found group selector %u for %s\n" ,
group_selector,
pin_group);
return group_selector;
}
group_selector++;
}
dev_err(pctldev->dev, "does not have pin group %s\n" ,
pin_group);
return -EINVAL;
}
bool pinctrl_gpio_can_use_line(struct gpio_chip *gc, unsigned int offset)
{
struct pinctrl_dev *pctldev;
struct pinctrl_gpio_range *range;
bool result;
int pin;
/*
* Try to obtain GPIO range , if it fails
* we ' re probably dealing with GPIO driver
* without a backing pin controller - bail out .
*/
if (pinctrl_get_device_gpio_range(gc, offset, &pctldev, &range))
return true ;
mutex_lock(&pctldev->mutex);
/* Convert to the pin controllers number space */
pin = gpio_to_pin(range, gc, offset);
result = pinmux_can_be_used_for_gpio(pctldev, pin);
mutex_unlock(&pctldev->mutex);
return result;
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_can_use_line);
/**
* pinctrl_gpio_request ( ) - request a single pin to be used as GPIO
* @ gc : GPIO chip structure from the GPIO subsystem
* @ offset : hardware offset of the GPIO relative to the controller
*
* This function should * ONLY * be used from gpiolib - based GPIO drivers ,
* as part of their gpio_request ( ) semantics , platforms and individual drivers
* shall * NOT * request GPIO pins to be muxed in .
*/
int pinctrl_gpio_request(struct gpio_chip *gc, unsigned int offset)
{
struct pinctrl_gpio_range *range;
struct pinctrl_dev *pctldev;
int ret, pin;
ret = pinctrl_get_device_gpio_range(gc, offset, &pctldev, &range);
if (ret) {
if (pinctrl_ready_for_gpio_range(gc, offset))
ret = 0 ;
return ret;
}
mutex_lock(&pctldev->mutex);
/* Convert to the pin controllers number space */
pin = gpio_to_pin(range, gc, offset);
ret = pinmux_request_gpio(pctldev, range, pin, gc->base + offset);
mutex_unlock(&pctldev->mutex);
return ret;
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_request);
/**
* pinctrl_gpio_free ( ) - free control on a single pin , currently used as GPIO
* @ gc : GPIO chip structure from the GPIO subsystem
* @ offset : hardware offset of the GPIO relative to the controller
*
* This function should * ONLY * be used from gpiolib - based GPIO drivers ,
* as part of their gpio_request ( ) semantics , platforms and individual drivers
* shall * NOT * request GPIO pins to be muxed in .
*/
void pinctrl_gpio_free(struct gpio_chip *gc, unsigned int offset)
{
struct pinctrl_gpio_range *range;
struct pinctrl_dev *pctldev;
int ret, pin;
ret = pinctrl_get_device_gpio_range(gc, offset, &pctldev, &range);
if (ret)
return ;
mutex_lock(&pctldev->mutex);
/* Convert to the pin controllers number space */
pin = gpio_to_pin(range, gc, offset);
pinmux_free_gpio(pctldev, pin, range);
mutex_unlock(&pctldev->mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_free);
static int pinctrl_gpio_direction(struct gpio_chip *gc, unsigned int offset,
bool input)
{
struct pinctrl_dev *pctldev;
struct pinctrl_gpio_range *range;
int ret;
int pin;
ret = pinctrl_get_device_gpio_range(gc, offset, &pctldev, &range);
if (ret) {
return ret;
}
mutex_lock(&pctldev->mutex);
/* Convert to the pin controllers number space */
pin = gpio_to_pin(range, gc, offset);
ret = pinmux_gpio_direction(pctldev, range, pin, input);
mutex_unlock(&pctldev->mutex);
return ret;
}
/**
* pinctrl_gpio_direction_input ( ) - request a GPIO pin to go into input mode
* @ gc : GPIO chip structure from the GPIO subsystem
* @ offset : hardware offset of the GPIO relative to the controller
*
* This function should * ONLY * be used from gpiolib - based GPIO drivers ,
* as part of their gpio_direction_input ( ) semantics , platforms and individual
* drivers shall * NOT * touch pin control GPIO calls .
*/
int pinctrl_gpio_direction_input(struct gpio_chip *gc, unsigned int offset)
{
return pinctrl_gpio_direction(gc, offset, true );
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
/**
* pinctrl_gpio_direction_output ( ) - request a GPIO pin to go into output mode
* @ gc : GPIO chip structure from the GPIO subsystem
* @ offset : hardware offset of the GPIO relative to the controller
*
* This function should * ONLY * be used from gpiolib - based GPIO drivers ,
* as part of their gpio_direction_output ( ) semantics , platforms and individual
* drivers shall * NOT * touch pin control GPIO calls .
*/
int pinctrl_gpio_direction_output(struct gpio_chip *gc, unsigned int offset)
{
return pinctrl_gpio_direction(gc, offset, false );
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
/**
* pinctrl_gpio_set_config ( ) - Apply config to given GPIO pin
* @ gc : GPIO chip structure from the GPIO subsystem
* @ offset : hardware offset of the GPIO relative to the controller
* @ config : the configuration to apply to the GPIO
*
* This function should * ONLY * be used from gpiolib - based GPIO drivers , if
* they need to call the underlying pin controller to change GPIO config
* ( for example set debounce time ) .
*/
int pinctrl_gpio_set_config(struct gpio_chip *gc, unsigned int offset,
unsigned long config)
{
unsigned long configs[] = { config };
struct pinctrl_gpio_range *range;
struct pinctrl_dev *pctldev;
int ret, pin;
ret = pinctrl_get_device_gpio_range(gc, offset, &pctldev, &range);
if (ret)
return ret;
mutex_lock(&pctldev->mutex);
pin = gpio_to_pin(range, gc, offset);
ret = pinconf_set_config(pctldev, pin, configs, ARRAY_SIZE(configs));
mutex_unlock(&pctldev->mutex);
return ret;
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_set_config);
static struct pinctrl_state *find_state(struct pinctrl *p,
const char *name)
{
struct pinctrl_state *state;
list_for_each_entry(state, &p->states, node)
if (!strcmp(state->name, name))
return state;
return NULL;
}
static struct pinctrl_state *create_state(struct pinctrl *p,
const char *name)
{
struct pinctrl_state *state;
state = kzalloc(sizeof (*state), GFP_KERNEL);
if (!state)
return ERR_PTR(-ENOMEM);
state->name = name;
INIT_LIST_HEAD(&state->settings);
list_add_tail(&state->node, &p->states);
return state;
}
static int add_setting(struct pinctrl *p, struct pinctrl_dev *pctldev,
const struct pinctrl_map *map)
{
struct pinctrl_state *state;
struct pinctrl_setting *setting;
int ret;
state = find_state(p, map->name);
if (!state)
state = create_state(p, map->name);
if (IS_ERR(state))
return PTR_ERR(state);
if (map->type == PIN_MAP_TYPE_DUMMY_STATE)
return 0 ;
setting = kzalloc(sizeof (*setting), GFP_KERNEL);
if (!setting)
return -ENOMEM;
setting->type = map->type;
if (pctldev)
setting->pctldev = pctldev;
else
setting->pctldev =
get_pinctrl_dev_from_devname(map->ctrl_dev_name);
if (!setting->pctldev) {
kfree(setting);
/* Do not defer probing of hogs (circular loop) */
if (!strcmp(map->ctrl_dev_name, map->dev_name))
return -ENODEV;
/*
* OK let us guess that the driver is not there yet , and
* let ' s defer obtaining this pinctrl handle to later . . .
*/
dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe" ,
map->ctrl_dev_name);
return -EPROBE_DEFER;
}
setting->dev_name = map->dev_name;
switch (map->type) {
case PIN_MAP_TYPE_MUX_GROUP:
ret = pinmux_map_to_setting(map, setting);
break ;
case PIN_MAP_TYPE_CONFIGS_PIN:
case PIN_MAP_TYPE_CONFIGS_GROUP:
ret = pinconf_map_to_setting(map, setting);
break ;
default :
ret = -EINVAL;
break ;
}
if (ret < 0 ) {
kfree(setting);
return ret;
}
list_add_tail(&setting->node, &state->settings);
return 0 ;
}
static struct pinctrl *find_pinctrl(struct device *dev)
{
struct pinctrl *p;
mutex_lock(&pinctrl_list_mutex);
list_for_each_entry(p, &pinctrl_list, node)
if (p->dev == dev) {
mutex_unlock(&pinctrl_list_mutex);
return p;
}
mutex_unlock(&pinctrl_list_mutex);
return NULL;
}
static void pinctrl_free(struct pinctrl *p, bool inlist);
static struct pinctrl *create_pinctrl(struct device *dev,
struct pinctrl_dev *pctldev)
{
struct pinctrl *p;
const char *devname;
struct pinctrl_maps *maps_node;
const struct pinctrl_map *map;
int ret;
/*
* create the state cookie holder struct pinctrl for each
* mapping , this is what consumers will get when requesting
* a pin control handle with pinctrl_get ( )
*/
p = kzalloc(sizeof (*p), GFP_KERNEL);
if (!p)
return ERR_PTR(-ENOMEM);
p->dev = dev;
INIT_LIST_HEAD(&p->states);
INIT_LIST_HEAD(&p->dt_maps);
ret = pinctrl_dt_to_map(p, pctldev);
if (ret < 0 ) {
kfree(p);
return ERR_PTR(ret);
}
devname = dev_name(dev);
mutex_lock(&pinctrl_maps_mutex);
/* Iterate over the pin control maps to locate the right ones */
for_each_pin_map(maps_node, map) {
/* Map must be for this device */
if (strcmp(map->dev_name, devname))
continue ;
/*
* If pctldev is not null , we are claiming hog for it ,
* that means , setting that is served by pctldev by itself .
*
* Thus we must skip map that is for this device but is served
* by other device .
*/
if (pctldev &&
strcmp(dev_name(pctldev->dev), map->ctrl_dev_name))
continue ;
ret = add_setting(p, pctldev, map);
/*
* At this point the adding of a setting may :
*
* - Defer , if the pinctrl device is not yet available
* - Fail , if the pinctrl device is not yet available ,
* AND the setting is a hog . We cannot defer that , since
* the hog will kick in immediately after the device
* is registered .
*
* If the error returned was not - EPROBE_DEFER then we
* accumulate the errors to see if we end up with
* an - EPROBE_DEFER later , as that is the worst case .
*/
if (ret == -EPROBE_DEFER) {
mutex_unlock(&pinctrl_maps_mutex);
pinctrl_free(p, false );
return ERR_PTR(ret);
}
}
mutex_unlock(&pinctrl_maps_mutex);
if (ret < 0 ) {
/* If some other error than deferral occurred, return here */
pinctrl_free(p, false );
return ERR_PTR(ret);
}
kref_init(&p->users);
/* Add the pinctrl handle to the global list */
mutex_lock(&pinctrl_list_mutex);
list_add_tail(&p->node, &pinctrl_list);
mutex_unlock(&pinctrl_list_mutex);
return p;
}
/**
* pinctrl_get ( ) - retrieves the pinctrl handle for a device
* @ dev : the device to obtain the handle for
*/
struct pinctrl *pinctrl_get(struct device *dev)
{
struct pinctrl *p;
if (WARN_ON(!dev))
return ERR_PTR(-EINVAL);
/*
* See if somebody else ( such as the device core ) has already
* obtained a handle to the pinctrl for this device . In that case ,
* return another pointer to it .
*/
p = find_pinctrl(dev);
if (p) {
dev_dbg(dev, "obtain a copy of previously claimed pinctrl\n" );
kref_get(&p->users);
return p;
}
return create_pinctrl(dev, NULL);
}
EXPORT_SYMBOL_GPL(pinctrl_get);
static void pinctrl_free_setting(bool disable_setting,
struct pinctrl_setting *setting)
{
switch (setting->type) {
case PIN_MAP_TYPE_MUX_GROUP:
if (disable_setting)
pinmux_disable_setting(setting);
pinmux_free_setting(setting);
break ;
case PIN_MAP_TYPE_CONFIGS_PIN:
case PIN_MAP_TYPE_CONFIGS_GROUP:
pinconf_free_setting(setting);
break ;
default :
break ;
}
}
static void pinctrl_free(struct pinctrl *p, bool inlist)
{
struct pinctrl_state *state, *n1;
struct pinctrl_setting *setting, *n2;
mutex_lock(&pinctrl_list_mutex);
list_for_each_entry_safe(state, n1, &p->states, node) {
list_for_each_entry_safe(setting, n2, &state->settings, node) {
pinctrl_free_setting(state == p->state, setting);
list_del(&setting->node);
kfree(setting);
}
list_del(&state->node);
kfree(state);
}
pinctrl_dt_free_maps(p);
if (inlist)
list_del(&p->node);
kfree(p);
mutex_unlock(&pinctrl_list_mutex);
}
/**
* pinctrl_release ( ) - release the pinctrl handle
* @ kref : the kref in the pinctrl being released
*/
static void pinctrl_release(struct kref *kref)
{
struct pinctrl *p = container_of(kref, struct pinctrl, users);
pinctrl_free(p, true );
}
/**
* pinctrl_put ( ) - decrease use count on a previously claimed pinctrl handle
* @ p : the pinctrl handle to release
*/
void pinctrl_put(struct pinctrl *p)
{
kref_put(&p->users, pinctrl_release);
}
EXPORT_SYMBOL_GPL(pinctrl_put);
/**
* pinctrl_lookup_state ( ) - retrieves a state handle from a pinctrl handle
* @ p : the pinctrl handle to retrieve the state from
* @ name : the state name to retrieve
*/
struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p,
const char *name)
{
struct pinctrl_state *state;
state = find_state(p, name);
if (!state) {
if (pinctrl_dummy_state) {
/* create dummy state */
dev_dbg(p->dev, "using pinctrl dummy state (%s)\n" ,
name);
state = create_state(p, name);
} else
state = ERR_PTR(-ENODEV);
}
return state;
}
EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
static void pinctrl_link_add(struct pinctrl_dev *pctldev,
struct device *consumer)
{
if (pctldev->desc->link_consumers)
device_link_add(consumer, pctldev->dev,
DL_FLAG_PM_RUNTIME |
DL_FLAG_AUTOREMOVE_CONSUMER);
}
static void pinctrl_cond_disable_mux_setting(struct pinctrl_state *state,
struct pinctrl_setting *target_setting)
{
struct pinctrl_setting *setting;
list_for_each_entry(setting, &state->settings, node) {
if (target_setting && (&setting->node == &target_setting->node))
break ;
if (setting->type == PIN_MAP_TYPE_MUX_GROUP)
pinmux_disable_setting(setting);
}
}
/**
* pinctrl_commit_state ( ) - select / activate / program a pinctrl state to HW
* @ p : the pinctrl handle for the device that requests configuration
* @ state : the state handle to select / activate / program
*/
static int pinctrl_commit_state(struct pinctrl *p, struct pinctrl_state *state)
{
struct pinctrl_setting *setting;
struct pinctrl_state *old_state = READ_ONCE(p->state);
int ret;
if (old_state) {
/*
* For each pinmux setting in the old state , forget SW ' s record
* of mux owner for that pingroup . Any pingroups which are
* still owned by the new state will be re - acquired by the call
* to pinmux_enable_setting ( ) in the loop below .
*/
pinctrl_cond_disable_mux_setting(old_state, NULL);
}
p->state = NULL;
/* Apply all the settings for the new state - pinmux first */
list_for_each_entry(setting, &state->settings, node) {
switch (setting->type) {
case PIN_MAP_TYPE_MUX_GROUP:
ret = pinmux_enable_setting(setting);
break ;
case PIN_MAP_TYPE_CONFIGS_PIN:
case PIN_MAP_TYPE_CONFIGS_GROUP:
ret = 0 ;
break ;
default :
ret = -EINVAL;
break ;
}
if (ret < 0 )
goto unapply_new_state;
/* Do not link hogs (circular dependency) */
if (p != setting->pctldev->p)
pinctrl_link_add(setting->pctldev, p->dev);
}
/* Apply all the settings for the new state - pinconf after */
list_for_each_entry(setting, &state->settings, node) {
switch (setting->type) {
case PIN_MAP_TYPE_MUX_GROUP:
ret = 0 ;
break ;
case PIN_MAP_TYPE_CONFIGS_PIN:
case PIN_MAP_TYPE_CONFIGS_GROUP:
ret = pinconf_apply_setting(setting);
break ;
default :
ret = -EINVAL;
break ;
}
if (ret < 0 ) {
goto unapply_mux_setting;
}
/* Do not link hogs (circular dependency) */
if (p != setting->pctldev->p)
pinctrl_link_add(setting->pctldev, p->dev);
}
p->state = state;
return 0 ;
unapply_mux_setting:
pinctrl_cond_disable_mux_setting(state, NULL);
goto restore_old_state;
unapply_new_state:
dev_err(p->dev, "Error applying setting, reverse things back\n" );
/*
* All we can do here is pinmux_disable_setting .
* That means that some pins are muxed differently now
* than they were before applying the setting ( We can ' t
* " unmux a pin " ! ) , but it ' s not a big deal since the pins
* are free to be muxed by another apply_setting .
*/
pinctrl_cond_disable_mux_setting(state, setting);
restore_old_state:
/* There's no infinite recursive loop here because p->state is NULL */
if (old_state)
pinctrl_select_state(p, old_state);
return ret;
}
/**
* pinctrl_select_state ( ) - select / activate / program a pinctrl state to HW
* @ p : the pinctrl handle for the device that requests configuration
* @ state : the state handle to select / activate / program
*/
int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
{
if (p->state == state)
return 0 ;
return pinctrl_commit_state(p, state);
}
EXPORT_SYMBOL_GPL(pinctrl_select_state);
static void devm_pinctrl_release(struct device *dev, void *res)
{
pinctrl_put(*(struct pinctrl **)res);
}
/**
* devm_pinctrl_get ( ) - Resource managed pinctrl_get ( )
* @ dev : the device to obtain the handle for
*
* If there is a need to explicitly destroy the returned struct pinctrl ,
* devm_pinctrl_put ( ) should be used , rather than plain pinctrl_put ( ) .
*/
struct pinctrl *devm_pinctrl_get(struct device *dev)
{
struct pinctrl **ptr, *p;
ptr = devres_alloc(devm_pinctrl_release, sizeof (*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
p = pinctrl_get(dev);
if (!IS_ERR(p)) {
*ptr = p;
devres_add(dev, ptr);
} else {
devres_free(ptr);
}
return p;
}
EXPORT_SYMBOL_GPL(devm_pinctrl_get);
static int devm_pinctrl_match(struct device *dev, void *res, void *data)
{
struct pinctrl **p = res;
return *p == data;
}
/**
* devm_pinctrl_put ( ) - Resource managed pinctrl_put ( )
* @ p : the pinctrl handle to release
*
* Deallocate a struct pinctrl obtained via devm_pinctrl_get ( ) . Normally
* this function will not need to be called and the resource management
* code will ensure that the resource is freed .
*/
void devm_pinctrl_put(struct pinctrl *p)
{
WARN_ON(devres_release(p->dev, devm_pinctrl_release,
devm_pinctrl_match, p));
}
EXPORT_SYMBOL_GPL(devm_pinctrl_put);
/**
* pinctrl_register_mappings ( ) - register a set of pin controller mappings
* @ maps : the pincontrol mappings table to register . Note the pinctrl - core
* keeps a reference to the passed in maps , so they should _ not_ be
* marked with _ _ initdata .
* @ num_maps : the number of maps in the mapping table
*/
int pinctrl_register_mappings(const struct pinctrl_map *maps,
unsigned int num_maps)
{
int i, ret;
struct pinctrl_maps *maps_node;
pr_debug("add %u pinctrl maps\n" , num_maps);
/* First sanity check the new mapping */
for (i = 0 ; i < num_maps; i++) {
if (!maps[i].dev_name) {
pr_err("failed to register map %s (%d): no device given\n" ,
maps[i].name, i);
return -EINVAL;
}
if (!maps[i].name) {
pr_err("failed to register map %d: no map name given\n" ,
i);
return -EINVAL;
}
if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE &&
!maps[i].ctrl_dev_name) {
pr_err("failed to register map %s (%d): no pin control device given\n" ,
maps[i].name, i);
return -EINVAL;
}
switch (maps[i].type) {
case PIN_MAP_TYPE_DUMMY_STATE:
break ;
case PIN_MAP_TYPE_MUX_GROUP:
ret = pinmux_validate_map(&maps[i], i);
if (ret < 0 )
return ret;
break ;
case PIN_MAP_TYPE_CONFIGS_PIN:
case PIN_MAP_TYPE_CONFIGS_GROUP:
ret = pinconf_validate_map(&maps[i], i);
if (ret < 0 )
return ret;
break ;
default :
pr_err("failed to register map %s (%d): invalid type given\n" ,
maps[i].name, i);
return -EINVAL;
}
}
maps_node = kzalloc(sizeof (*maps_node), GFP_KERNEL);
if (!maps_node)
return -ENOMEM;
maps_node->maps = maps;
maps_node->num_maps = num_maps;
mutex_lock(&pinctrl_maps_mutex);
list_add_tail(&maps_node->node, &pinctrl_maps);
mutex_unlock(&pinctrl_maps_mutex);
return 0 ;
}
EXPORT_SYMBOL_GPL(pinctrl_register_mappings);
/**
* pinctrl_unregister_mappings ( ) - unregister a set of pin controller mappings
* @ map : the pincontrol mappings table passed to pinctrl_register_mappings ( )
* when registering the mappings .
*/
void pinctrl_unregister_mappings(const struct pinctrl_map *map)
{
struct pinctrl_maps *maps_node;
mutex_lock(&pinctrl_maps_mutex);
list_for_each_entry(maps_node, &pinctrl_maps, node) {
if (maps_node->maps == map) {
list_del(&maps_node->node);
kfree(maps_node);
mutex_unlock(&pinctrl_maps_mutex);
return ;
}
}
mutex_unlock(&pinctrl_maps_mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_unregister_mappings);
static void devm_pinctrl_unregister_mappings(void *maps)
{
pinctrl_unregister_mappings(maps);
}
/**
* devm_pinctrl_register_mappings ( ) - Resource managed pinctrl_register_mappings ( )
* @ dev : device for which mappings are registered
* @ maps : the pincontrol mappings table to register . Note the pinctrl - core
* keeps a reference to the passed in maps , so they should _ not_ be
* marked with _ _ initdata .
* @ num_maps : the number of maps in the mapping table
*
* Returns : 0 on success , or negative errno on failure .
*/
int devm_pinctrl_register_mappings(struct device *dev,
const struct pinctrl_map *maps,
unsigned int num_maps)
{
int ret;
ret = pinctrl_register_mappings(maps, num_maps);
if (ret)
return ret;
return devm_add_action_or_reset(dev, devm_pinctrl_unregister_mappings, (void *)maps);
}
EXPORT_SYMBOL_GPL(devm_pinctrl_register_mappings);
/**
* pinctrl_force_sleep ( ) - turn a given controller device into sleep state
* @ pctldev : pin controller device
*/
int pinctrl_force_sleep(struct pinctrl_dev *pctldev)
{
if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_sleep))
return pinctrl_commit_state(pctldev->p, pctldev->hog_sleep);
return 0 ;
}
EXPORT_SYMBOL_GPL(pinctrl_force_sleep);
/**
* pinctrl_force_default ( ) - turn a given controller device into default state
* @ pctldev : pin controller device
*/
int pinctrl_force_default(struct pinctrl_dev *pctldev)
{
if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_default))
return pinctrl_commit_state(pctldev->p, pctldev->hog_default);
return 0 ;
}
EXPORT_SYMBOL_GPL(pinctrl_force_default);
/**
* pinctrl_init_done ( ) - tell pinctrl probe is done
*
* We ' ll use this time to switch the pins from " init " to " default " unless the
* driver selected some other state .
*
* @ dev : device to that ' s done probing
*/
int pinctrl_init_done(struct device *dev)
{
struct dev_pin_info *pins = dev->pins;
int ret;
if (!pins)
return 0 ;
if (IS_ERR(pins->init_state))
return 0 ; /* No such state */
if (pins->p->state != pins->init_state)
return 0 ; /* Not at init anyway */
if (IS_ERR(pins->default_state))
return 0 ; /* No default state */
ret = pinctrl_select_state(pins->p, pins->default_state);
if (ret)
dev_err(dev, "failed to activate default pinctrl state\n" );
return ret;
}
static int pinctrl_select_bound_state(struct device *dev,
struct pinctrl_state *state)
{
struct dev_pin_info *pins = dev->pins;
int ret;
if (IS_ERR(state))
return 0 ; /* No such state */
ret = pinctrl_select_state(pins->p, state);
if (ret)
dev_err(dev, "failed to activate pinctrl state %s\n" ,
state->name);
return ret;
}
/**
* pinctrl_select_default_state ( ) - select default pinctrl state
* @ dev : device to select default state for
*/
int pinctrl_select_default_state(struct device *dev)
{
if (!dev->pins)
return 0 ;
return pinctrl_select_bound_state(dev, dev->pins->default_state);
}
EXPORT_SYMBOL_GPL(pinctrl_select_default_state);
#ifdef CONFIG_PM
/**
* pinctrl_pm_select_default_state ( ) - select default pinctrl state for PM
* @ dev : device to select default state for
*/
int pinctrl_pm_select_default_state(struct device *dev)
{
return pinctrl_select_default_state(dev);
}
EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state);
/**
* pinctrl_pm_select_sleep_state ( ) - select sleep pinctrl state for PM
* @ dev : device to select sleep state for
*/
int pinctrl_pm_select_sleep_state(struct device *dev)
{
if (!dev->pins)
return 0 ;
return pinctrl_select_bound_state(dev, dev->pins->sleep_state);
}
EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state);
/**
* pinctrl_pm_select_idle_state ( ) - select idle pinctrl state for PM
* @ dev : device to select idle state for
*/
int pinctrl_pm_select_idle_state(struct device *dev)
{
if (!dev->pins)
return 0 ;
return pinctrl_select_bound_state(dev, dev->pins->idle_state);
}
EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state);
#endif
#ifdef CONFIG_DEBUG_FS
static int pinctrl_pins_show(struct seq_file *s, void *what)
{
struct pinctrl_dev *pctldev = s->private ;
const struct pinctrl_ops *ops = pctldev->desc->pctlops;
unsigned int i, pin;
#ifdef CONFIG_GPIOLIB
struct gpio_device *gdev = NULL;
struct pinctrl_gpio_range *range;
int gpio_num;
#endif
seq_printf(s, "registered pins: %d\n" , pctldev->desc->npins);
mutex_lock(&pctldev->mutex);
/* The pin number can be retrived from the pin controller descriptor */
for (i = 0 ; i < pctldev->desc->npins; i++) {
struct pin_desc *desc;
pin = pctldev->desc->pins[i].number;
desc = pin_desc_get(pctldev, pin);
/* Pin space may be sparse */
if (!desc)
continue ;
seq_printf(s, "pin %d (%s) " , pin, desc->name);
#ifdef CONFIG_GPIOLIB
gdev = NULL;
gpio_num = -1 ;
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
if (range->pins != NULL) {
for (int i = 0 ; i < range->npins; ++i) {
if (range->pins[i] == pin) {
gpio_num = range->base + i;
break ;
}
}
} else if ((pin >= range->pin_base) &&
(pin < (range->pin_base + range->npins))) {
gpio_num =
range->base + (pin - range->pin_base);
}
if (gpio_num != -1 )
break ;
}
if (gpio_num >= 0 )
/*
* FIXME : gpio_num comes from the global GPIO numberspace .
* we need to get rid of the range - > base eventually and
* get the descriptor directly from the gpio_chip .
*/
gdev = gpiod_to_gpio_device(gpio_to_desc(gpio_num));
if (gdev)
seq_printf(s, "%u:%s " ,
gpio_num - gpio_device_get_base(gdev),
gpio_device_get_label(gdev));
else
seq_puts(s, "0:? " );
#endif
/* Driver-specific info per pin */
if (ops->pin_dbg_show)
ops->pin_dbg_show(pctldev, s, pin);
seq_puts(s, "\n" );
}
mutex_unlock(&pctldev->mutex);
return 0 ;
}
DEFINE_SHOW_ATTRIBUTE(pinctrl_pins);
static int pinctrl_groups_show(struct seq_file *s, void *what)
{
struct pinctrl_dev *pctldev = s->private ;
const struct pinctrl_ops *ops = pctldev->desc->pctlops;
unsigned int ngroups, selector = 0 ;
mutex_lock(&pctldev->mutex);
ngroups = ops->get_groups_count(pctldev);
seq_puts(s, "registered pin groups:\n" );
while (selector < ngroups) {
const unsigned int *pins = NULL;
unsigned int num_pins = 0 ;
const char *gname = ops->get_group_name(pctldev, selector);
const char *pname;
int ret = 0 ;
int i;
if (ops->get_group_pins)
ret = ops->get_group_pins(pctldev, selector,
&pins, &num_pins);
if (ret)
seq_printf(s, "%s [ERROR GETTING PINS]\n" ,
gname);
else {
seq_printf(s, "group: %s\n" , gname);
for (i = 0 ; i < num_pins; i++) {
pname = pin_get_name(pctldev, pins[i]);
if (WARN_ON(!pname)) {
mutex_unlock(&pctldev->mutex);
return -EINVAL;
}
seq_printf(s, "pin %d (%s)\n" , pins[i], pname);
}
seq_puts(s, "\n" );
}
selector++;
}
mutex_unlock(&pctldev->mutex);
return 0 ;
}
DEFINE_SHOW_ATTRIBUTE(pinctrl_groups);
static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
{
struct pinctrl_dev *pctldev = s->private ;
struct pinctrl_gpio_range *range;
seq_puts(s, "GPIO ranges handled:\n" );
mutex_lock(&pctldev->mutex);
/* Loop over the ranges */
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
if (range->pins) {
int a;
seq_printf(s, "%u: %s GPIOS [%u - %u] PINS {" ,
range->id, range->name,
range->base, (range->base + range->npins - 1 ));
for (a = 0 ; a < range->npins - 1 ; a++)
seq_printf(s, "%u, " , range->pins[a]);
seq_printf(s, "%u}\n" , range->pins[a]);
}
else
seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n" ,
range->id, range->name,
range->base, (range->base + range->npins - 1 ),
range->pin_base,
(range->pin_base + range->npins - 1 ));
}
mutex_unlock(&pctldev->mutex);
return 0 ;
}
DEFINE_SHOW_ATTRIBUTE(pinctrl_gpioranges);
static int pinctrl_devices_show(struct seq_file *s, void *what)
{
struct pinctrl_dev *pctldev;
seq_puts(s, "name [pinmux] [pinconf]\n" );
mutex_lock(&pinctrldev_list_mutex);
list_for_each_entry(pctldev, &pinctrldev_list, node) {
seq_printf(s, "%s " , pctldev->desc->name);
if (pctldev->desc->pmxops)
seq_puts(s, "yes " );
else
seq_puts(s, "no " );
if (pctldev->desc->confops)
seq_puts(s, "yes" );
else
seq_puts(s, "no" );
seq_puts(s, "\n" );
}
mutex_unlock(&pinctrldev_list_mutex);
return 0 ;
}
DEFINE_SHOW_ATTRIBUTE(pinctrl_devices);
static inline const char *map_type(enum pinctrl_map_type type)
{
static const char * const names[] = {
"INVALID" ,
"DUMMY_STATE" ,
"MUX_GROUP" ,
"CONFIGS_PIN" ,
"CONFIGS_GROUP" ,
};
if (type >= ARRAY_SIZE(names))
return "UNKNOWN" ;
return names[type];
}
static int pinctrl_maps_show(struct seq_file *s, void *what)
{
struct pinctrl_maps *maps_node;
const struct pinctrl_map *map;
seq_puts(s, "Pinctrl maps:\n" );
mutex_lock(&pinctrl_maps_mutex);
for_each_pin_map(maps_node, map) {
seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n" ,
map->dev_name, map->name, map_type(map->type),
map->type);
if (map->type != PIN_MAP_TYPE_DUMMY_STATE)
seq_printf(s, "controlling device %s\n" ,
map->ctrl_dev_name);
switch (map->type) {
case PIN_MAP_TYPE_MUX_GROUP:
pinmux_show_map(s, map);
break ;
case PIN_MAP_TYPE_CONFIGS_PIN:
case PIN_MAP_TYPE_CONFIGS_GROUP:
pinconf_show_map(s, map);
break ;
default :
break ;
}
seq_putc(s, '\n' );
}
mutex_unlock(&pinctrl_maps_mutex);
return 0 ;
}
DEFINE_SHOW_ATTRIBUTE(pinctrl_maps);
static int pinctrl_show(struct seq_file *s, void *what)
{
struct pinctrl *p;
struct pinctrl_state *state;
struct pinctrl_setting *setting;
seq_puts(s, "Requested pin control handlers their pinmux maps:\n" );
mutex_lock(&pinctrl_list_mutex);
list_for_each_entry(p, &pinctrl_list, node) {
seq_printf(s, "device: %s current state: %s\n" ,
dev_name(p->dev),
p->state ? p->state->name : "none" );
list_for_each_entry(state, &p->states, node) {
seq_printf(s, " state: %s\n" , state->name);
list_for_each_entry(setting, &state->settings, node) {
struct pinctrl_dev *pctldev = setting->pctldev;
seq_printf(s, " type: %s controller %s " ,
map_type(setting->type),
pinctrl_dev_get_name(pctldev));
switch (setting->type) {
case PIN_MAP_TYPE_MUX_GROUP:
pinmux_show_setting(s, setting);
break ;
case PIN_MAP_TYPE_CONFIGS_PIN:
case PIN_MAP_TYPE_CONFIGS_GROUP:
pinconf_show_setting(s, setting);
break ;
default :
break ;
}
}
}
}
mutex_unlock(&pinctrl_list_mutex);
return 0 ;
}
DEFINE_SHOW_ATTRIBUTE(pinctrl);
static struct dentry *debugfs_root;
static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
{
struct dentry *device_root;
const char *debugfs_name;
if (pctldev->desc->name &&
strcmp(dev_name(pctldev->dev), pctldev->desc->name)) {
debugfs_name = devm_kasprintf(pctldev->dev, GFP_KERNEL,
"%s-%s" , dev_name(pctldev->dev),
pctldev->desc->name);
if (!debugfs_name) {
pr_warn("failed to determine debugfs dir name for %s\n" ,
dev_name(pctldev->dev));
return ;
}
} else {
debugfs_name = dev_name(pctldev->dev);
}
device_root = debugfs_create_dir(debugfs_name, debugfs_root);
pctldev->device_root = device_root;
if (IS_ERR(device_root) || !device_root) {
pr_warn("failed to create debugfs directory for %s\n" ,
dev_name(pctldev->dev));
return ;
}
debugfs_create_file("pins" , 0444 ,
device_root, pctldev, &pinctrl_pins_fops);
debugfs_create_file("pingroups" , 0444 ,
device_root, pctldev, &pinctrl_groups_fops);
debugfs_create_file("gpio-ranges" , 0444 ,
device_root, pctldev, &pinctrl_gpioranges_fops);
if (pctldev->desc->pmxops)
pinmux_init_device_debugfs(device_root, pctldev);
if (pctldev->desc->confops)
pinconf_init_device_debugfs(device_root, pctldev);
}
static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
{
debugfs_remove_recursive(pctldev->device_root);
}
static void pinctrl_init_debugfs(void )
{
debugfs_root = debugfs_create_dir("pinctrl" , NULL);
if (IS_ERR(debugfs_root)) {
pr_warn("failed to create debugfs directory\n" );
debugfs_root = NULL;
return ;
}
debugfs_create_file("pinctrl-devices" , 0444 ,
debugfs_root, NULL, &pinctrl_devices_fops);
debugfs_create_file("pinctrl-maps" , 0444 ,
debugfs_root, NULL, &pinctrl_maps_fops);
debugfs_create_file("pinctrl-handles" , 0444 ,
debugfs_root, NULL, &pinctrl_fops);
}
#else /* CONFIG_DEBUG_FS */
static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
{
}
static void pinctrl_init_debugfs(void )
{
}
static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev)
{
}
#endif
static int pinctrl_check_ops(struct pinctrl_dev *pctldev)
{
const struct pinctrl_ops *ops = pctldev->desc->pctlops;
if (!ops ||
!ops->get_groups_count ||
!ops->get_group_name)
return -EINVAL;
return 0 ;
}
/**
* pinctrl_init_controller ( ) - init a pin controller device
* @ pctldesc : descriptor for this pin controller
* @ dev : parent device for this pin controller
* @ driver_data : private pin controller data for this pin controller
*/
static struct pinctrl_dev *
pinctrl_init_controller(const struct pinctrl_desc *pctldesc, struct device *dev,
void *driver_data)
{
struct pinctrl_dev *pctldev;
int ret;
if (!pctldesc)
return ERR_PTR(-EINVAL);
if (!pctldesc->name)
return ERR_PTR(-EINVAL);
pctldev = kzalloc(sizeof (*pctldev), GFP_KERNEL);
if (!pctldev)
return ERR_PTR(-ENOMEM);
/* Initialize pin control device struct */
pctldev->owner = pctldesc->owner;
pctldev->desc = pctldesc;
pctldev->driver_data = driver_data;
INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
#ifdef CONFIG_GENERIC_PINCTRL_GROUPS
INIT_RADIX_TREE(&pctldev->pin_group_tree, GFP_KERNEL);
#endif
#ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS
INIT_RADIX_TREE(&pctldev->pin_function_tree, GFP_KERNEL);
#endif
INIT_LIST_HEAD(&pctldev->gpio_ranges);
INIT_LIST_HEAD(&pctldev->node);
pctldev->dev = dev;
mutex_init(&pctldev->mutex);
/* check core ops for sanity */
ret = pinctrl_check_ops(pctldev);
if (ret) {
dev_err(dev, "pinctrl ops lacks necessary functions\n" );
goto out_err;
}
/* If we're implementing pinmuxing, check the ops for sanity */
if (pctldesc->pmxops) {
ret = pinmux_check_ops(pctldev);
if (ret)
goto out_err;
}
/* If we're implementing pinconfig, check the ops for sanity */
if (pctldesc->confops) {
ret = pinconf_check_ops(pctldev);
if (ret)
goto out_err;
}
/* Register all the pins */
dev_dbg(dev, "try to register %d pins ...\n" , pctldesc->npins);
ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins);
if (ret) {
dev_err(dev, "error during pin registration\n" );
pinctrl_free_pindescs(pctldev, pctldesc->pins,
pctldesc->npins);
goto out_err;
}
return pctldev;
out_err:
mutex_destroy(&pctldev->mutex);
kfree(pctldev);
return ERR_PTR(ret);
}
static void pinctrl_uninit_controller(struct pinctrl_dev *pctldev,
const struct pinctrl_desc *pctldesc)
{
pinctrl_free_pindescs(pctldev, pctldesc->pins,
pctldesc->npins);
mutex_destroy(&pctldev->mutex);
kfree(pctldev);
}
static int pinctrl_claim_hogs(struct pinctrl_dev *pctldev)
{
pctldev->p = create_pinctrl(pctldev->dev, pctldev);
if (PTR_ERR(pctldev->p) == -ENODEV) {
dev_dbg(pctldev->dev, "no hogs found\n" );
return 0 ;
}
if (IS_ERR(pctldev->p)) {
dev_err(pctldev->dev, "error claiming hogs: %li\n" ,
PTR_ERR(pctldev->p));
return PTR_ERR(pctldev->p);
}
pctldev->hog_default =
pinctrl_lookup_state(pctldev->p, PINCTRL_STATE_DEFAULT);
if (IS_ERR(pctldev->hog_default)) {
dev_dbg(pctldev->dev,
"failed to lookup the default state\n" );
} else {
if (pinctrl_select_state(pctldev->p,
pctldev->hog_default))
dev_err(pctldev->dev,
"failed to select default state\n" );
}
pctldev->hog_sleep =
pinctrl_lookup_state(pctldev->p,
PINCTRL_STATE_SLEEP);
if (IS_ERR(pctldev->hog_sleep))
dev_dbg(pctldev->dev,
"failed to lookup the sleep state\n" );
return 0 ;
}
int pinctrl_enable(struct pinctrl_dev *pctldev)
{
int error;
error = pinctrl_claim_hogs(pctldev);
if (error) {
dev_err(pctldev->dev, "could not claim hogs: %i\n" , error);
return error;
}
mutex_lock(&pinctrldev_list_mutex);
list_add_tail(&pctldev->node, &pinctrldev_list);
mutex_unlock(&pinctrldev_list_mutex);
pinctrl_init_device_debugfs(pctldev);
return 0 ;
}
EXPORT_SYMBOL_GPL(pinctrl_enable);
/**
* pinctrl_register ( ) - register a pin controller device
* @ pctldesc : descriptor for this pin controller
* @ dev : parent device for this pin controller
* @ driver_data : private pin controller data for this pin controller
*
* Note that pinctrl_register ( ) is known to have problems as the pin
* controller driver functions are called before the driver has a
* struct pinctrl_dev handle . To avoid issues later on , please use the
* new pinctrl_register_and_init ( ) below instead .
*/
struct pinctrl_dev *pinctrl_register(const struct pinctrl_desc *pctldesc,
struct device *dev, void *driver_data)
{
struct pinctrl_dev *pctldev;
int error;
pctldev = pinctrl_init_controller(pctldesc, dev, driver_data);
if (IS_ERR(pctldev))
return pctldev;
error = pinctrl_enable(pctldev);
if (error) {
pinctrl_uninit_controller(pctldev, pctldesc);
return ERR_PTR(error);
}
return pctldev;
}
EXPORT_SYMBOL_GPL(pinctrl_register);
/**
* pinctrl_register_and_init ( ) - register and init pin controller device
* @ pctldesc : descriptor for this pin controller
* @ dev : parent device for this pin controller
* @ driver_data : private pin controller data for this pin controller
* @ pctldev : pin controller device
*
* Note that pinctrl_enable ( ) still needs to be manually called after
* this once the driver is ready .
*/
int pinctrl_register_and_init(const struct pinctrl_desc *pctldesc,
struct device *dev, void *driver_data,
struct pinctrl_dev **pctldev)
{
struct pinctrl_dev *p;
p = pinctrl_init_controller(pctldesc, dev, driver_data);
if (IS_ERR(p))
return PTR_ERR(p);
/*
* We have pinctrl_start ( ) call functions in the pin controller
* driver with create_pinctrl ( ) for at least dt_node_to_map ( ) . So
* let ' s make sure pctldev is properly initialized for the
* pin controller driver before we do anything .
*/
*pctldev = p;
return 0 ;
}
EXPORT_SYMBOL_GPL(pinctrl_register_and_init);
/**
* pinctrl_unregister ( ) - unregister pinmux
* @ pctldev : pin controller to unregister
*
* Called by pinmux drivers to unregister a pinmux .
*/
void pinctrl_unregister(struct pinctrl_dev *pctldev)
{
struct pinctrl_gpio_range *range, *n;
if (!pctldev)
return ;
mutex_lock(&pctldev->mutex);
pinctrl_remove_device_debugfs(pctldev);
mutex_unlock(&pctldev->mutex);
if (!IS_ERR_OR_NULL(pctldev->p))
pinctrl_put(pctldev->p);
mutex_lock(&pinctrldev_list_mutex);
mutex_lock(&pctldev->mutex);
/* TODO: check that no pinmuxes are still active? */
list_del(&pctldev->node);
pinmux_generic_free_functions(pctldev);
pinctrl_generic_free_groups(pctldev);
/* Destroy descriptor tree */
pinctrl_free_pindescs(pctldev, pctldev->desc->pins,
pctldev->desc->npins);
/* remove gpio ranges map */
list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node)
list_del(&range->node);
mutex_unlock(&pctldev->mutex);
mutex_destroy(&pctldev->mutex);
kfree(pctldev);
mutex_unlock(&pinctrldev_list_mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_unregister);
static void devm_pinctrl_dev_release(struct device *dev, void *res)
{
struct pinctrl_dev *pctldev = *(struct pinctrl_dev **)res;
pinctrl_unregister(pctldev);
}
static int devm_pinctrl_dev_match(struct device *dev, void *res, void *data)
{
struct pctldev **r = res;
if (WARN_ON(!r || !*r))
return 0 ;
return *r == data;
}
/**
* devm_pinctrl_register ( ) - Resource managed version of pinctrl_register ( ) .
* @ dev : parent device for this pin controller
* @ pctldesc : descriptor for this pin controller
* @ driver_data : private pin controller data for this pin controller
*
* Returns an error pointer if pincontrol register failed . Otherwise
* it returns valid pinctrl handle .
*
* The pinctrl device will be automatically released when the device is unbound .
*/
struct pinctrl_dev *devm_pinctrl_register(struct device *dev,
const struct pinctrl_desc *pctldesc,
void *driver_data)
{
struct pinctrl_dev **ptr, *pctldev;
ptr = devres_alloc(devm_pinctrl_dev_release, sizeof (*ptr), GFP_KERNEL);
if (!ptr)
return ERR_PTR(-ENOMEM);
pctldev = pinctrl_register(pctldesc, dev, driver_data);
if (IS_ERR(pctldev)) {
devres_free(ptr);
return pctldev;
}
*ptr = pctldev;
devres_add(dev, ptr);
return pctldev;
}
EXPORT_SYMBOL_GPL(devm_pinctrl_register);
/**
* devm_pinctrl_register_and_init ( ) - Resource managed pinctrl register and init
* @ dev : parent device for this pin controller
* @ pctldesc : descriptor for this pin controller
* @ driver_data : private pin controller data for this pin controller
* @ pctldev : pin controller device
*
* Returns zero on success or an error number on failure .
*
* The pinctrl device will be automatically released when the device is unbound .
*/
int devm_pinctrl_register_and_init(struct device *dev,
const struct pinctrl_desc *pctldesc,
void *driver_data,
struct pinctrl_dev **pctldev)
{
struct pinctrl_dev **ptr;
int error;
ptr = devres_alloc(devm_pinctrl_dev_release, sizeof (*ptr), GFP_KERNEL);
if (!ptr)
return -ENOMEM;
error = pinctrl_register_and_init(pctldesc, dev, driver_data, pctldev);
if (error) {
devres_free(ptr);
return error;
}
*ptr = *pctldev;
devres_add(dev, ptr);
return 0 ;
}
EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init);
/**
* devm_pinctrl_unregister ( ) - Resource managed version of pinctrl_unregister ( ) .
* @ dev : device for which resource was allocated
* @ pctldev : the pinctrl device to unregister .
*/
void devm_pinctrl_unregister(struct device *dev, struct pinctrl_dev *pctldev)
{
WARN_ON(devres_release(dev, devm_pinctrl_dev_release,
devm_pinctrl_dev_match, pctldev));
}
EXPORT_SYMBOL_GPL(devm_pinctrl_unregister);
static int __init pinctrl_init(void )
{
pr_info("initialized pinctrl subsystem\n" );
pinctrl_init_debugfs();
return 0 ;
}
/* init early since many drivers really need to initialized pinmux early */
core_initcall(pinctrl_init);
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