2
0
mirror of https://github.com/edk2-porting/linux-next.git synced 2024-12-23 20:53:53 +08:00
linux-next/drivers/pinctrl/core.c
Florian Fainelli 981ed1bfbc pinctrl: Really force states during suspend/resume
In case a platform only defaults a "default" set of pins, but not a
"sleep" set of pins, and this particular platform suspends and resumes
in a way that the pin states are not preserved by the hardware, when we
resume, we would call pinctrl_single_resume() -> pinctrl_force_default()
-> pinctrl_select_state() and the first thing we do is check that the
pins state is the same as before, and do nothing.

In order to fix this, decouple the actual state change from
pinctrl_select_state() and move it pinctrl_commit_state(), while keeping
the p->state == state check in pinctrl_select_state() not to change the
caller assumptions. pinctrl_force_sleep() and pinctrl_force_default()
are updated to bypass the state check by calling pinctrl_commit_state().

[Linus Walleij]
The forced pin control states are currently only used in some pin
controller drivers that grab their own reference to their own pins.
This is equal to the pin control hogs: pins taken by pin control
devices since there are no corresponding device in the Linux device
hierarchy, such as memory controller lines or unused GPIO lines,
or GPIO lines that are used orthogonally from the GPIO subsystem
but pincontrol-wise managed as hogs (non-strict mode, allowing
simultaneous use by GPIO and pin control). For this case forcing
the state from the drivers' suspend()/resume() callbacks makes
sense and should semantically match the name of the function.

Fixes: 6e5e959dde ("pinctrl: API changes to support multiple states per device")
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-12-20 08:24:13 +01:00

2291 lines
57 KiB
C

/*
* 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.
*
* License terms: GNU General Public License (GPL) version 2
*/
#define pr_fmt(fmt) "pinctrl core: " fmt
#include <linux/kernel.h>
#include <linux/kref.h>
#include <linux/export.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/sysfs.h>
#include <linux/debugfs.h>
#include <linux/seq_file.h>
#include <linux/pinctrl/consumer.h>
#include <linux/pinctrl/pinctrl.h>
#include <linux/pinctrl/machine.h>
#ifdef CONFIG_GPIOLIB
#include <asm-generic/gpio.h>
#endif
#include "core.h"
#include "devicetree.h"
#include "pinmux.h"
#include "pinconf.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 = NULL;
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 (pctldev->dev->of_node == 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 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_from_id() - look up a pin name from a pin id
* @pctldev: the pin control device to lookup the pin on
* @name: the name of the pin to look up
*/
const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned 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;
}
/**
* pin_is_valid() - check if pin exists on controller
* @pctldev: the pin control device to check the pin on
* @pin: pin to check, use the local pin controller index number
*
* This tells us whether a certain pin exist on a certain pin controller or
* not. Pin lists may be sparse, so some pins may not exist.
*/
bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
{
struct pin_desc *pindesc;
if (pin < 0)
return false;
mutex_lock(&pctldev->mutex);
pindesc = pin_desc_get(pctldev, pin);
mutex_unlock(&pctldev->mutex);
return pindesc != NULL;
}
EXPORT_SYMBOL_GPL(pin_is_valid);
/* Deletes a range of pin descriptors */
static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev,
const struct pinctrl_pin_desc *pins,
unsigned 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;
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;
/* Copy basic pin info */
if (pin->name) {
pindesc->name = pin->name;
} else {
pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", pin->number);
if (!pindesc->name) {
kfree(pindesc);
return -ENOMEM;
}
pindesc->dynamic_name = true;
}
pindesc->drv_data = pin->drv_data;
radix_tree_insert(&pctldev->pin_desc_tree, pin->number, pindesc);
pr_debug("registered pin %d (%s) on %s\n",
pin->number, pindesc->name, pctldev->desc->name);
return 0;
}
static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
const struct pinctrl_pin_desc *pins,
unsigned num_descs)
{
unsigned 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
* @gpio: gpio pin to translate to a pin number
*
* 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,
unsigned int gpio)
{
unsigned int offset = gpio - range->base;
if (range->pins)
return range->pins[offset];
else
return range->pin_base + offset;
}
/**
* pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
* @pctldev: pin controller device to check
* @gpio: gpio pin to check taken from the global GPIO pin space
*
* 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, unsigned gpio)
{
struct pinctrl_gpio_range *range = NULL;
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 (gpio >= range->base &&
gpio < 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
* @gpio: gpio pin to check taken from the global GPIO pin space
*
* 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(unsigned gpio)
{
struct pinctrl_dev *pctldev;
struct pinctrl_gpio_range *range = NULL;
struct gpio_chip *chip = gpio_to_chip(gpio);
if (WARN(!chip, "no gpio_chip for gpio%i?", gpio))
return false;
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 < chip->base ||
range->base > chip->base + chip->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 bool pinctrl_ready_for_gpio_range(unsigned gpio) { return true; }
#endif
/**
* pinctrl_get_device_gpio_range() - find device for GPIO range
* @gpio: the pin to locate the pin controller for
* @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(unsigned gpio,
struct pinctrl_dev **outdev,
struct pinctrl_gpio_range **outrange)
{
struct pinctrl_dev *pctldev = NULL;
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, gpio);
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
*
* 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 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 **pins, unsigned *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->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->pins;
*num_pins = group->num_pins;
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
* @gselector: 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);
/**
* 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,
int *pins, int num_pins, void *data)
{
struct group_desc *group;
group = devm_kzalloc(pctldev->dev, sizeof(*group), GFP_KERNEL);
if (!group)
return -ENOMEM;
group->name = name;
group->pins = pins;
group->num_pins = num_pins;
group->data = data;
radix_tree_insert(&pctldev->pin_group_tree, pctldev->num_groups,
group);
pctldev->num_groups++;
return 0;
}
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 ngroups = pctlops->get_groups_count(pctldev);
unsigned group_selector = 0;
while (group_selector < ngroups) {
const char *gname = pctlops->get_group_name(pctldev,
group_selector);
if (!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;
}
/**
* pinctrl_gpio_request() - request a single pin to be used as GPIO
* @gpio: the GPIO pin number from the GPIO subsystem number space
*
* 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(unsigned gpio)
{
struct pinctrl_dev *pctldev;
struct pinctrl_gpio_range *range;
int ret;
int pin;
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
if (ret) {
if (pinctrl_ready_for_gpio_range(gpio))
ret = 0;
return ret;
}
mutex_lock(&pctldev->mutex);
/* Convert to the pin controllers number space */
pin = gpio_to_pin(range, gpio);
ret = pinmux_request_gpio(pctldev, range, pin, gpio);
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
* @gpio: the GPIO pin number from the GPIO subsystem number space
*
* This function should *ONLY* be used from gpiolib-based GPIO drivers,
* as part of their gpio_free() semantics, platforms and individual drivers
* shall *NOT* request GPIO pins to be muxed out.
*/
void pinctrl_gpio_free(unsigned gpio)
{
struct pinctrl_dev *pctldev;
struct pinctrl_gpio_range *range;
int ret;
int pin;
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
if (ret) {
return;
}
mutex_lock(&pctldev->mutex);
/* Convert to the pin controllers number space */
pin = gpio_to_pin(range, gpio);
pinmux_free_gpio(pctldev, pin, range);
mutex_unlock(&pctldev->mutex);
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_free);
static int pinctrl_gpio_direction(unsigned gpio, bool input)
{
struct pinctrl_dev *pctldev;
struct pinctrl_gpio_range *range;
int ret;
int pin;
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
if (ret) {
return ret;
}
mutex_lock(&pctldev->mutex);
/* Convert to the pin controllers number space */
pin = gpio_to_pin(range, gpio);
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
* @gpio: the GPIO pin number from the GPIO subsystem number space
*
* 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(unsigned gpio)
{
return pinctrl_gpio_direction(gpio, true);
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input);
/**
* pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode
* @gpio: the GPIO pin number from the GPIO subsystem number space
*
* 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(unsigned gpio)
{
return pinctrl_gpio_direction(gpio, false);
}
EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output);
/**
* pinctrl_gpio_set_config() - Apply config to given GPIO pin
* @gpio: the GPIO pin number from the GPIO subsystem number space
* @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(unsigned gpio, 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(gpio, &pctldev, &range);
if (ret)
return ret;
mutex_lock(&pctldev->mutex);
pin = gpio_to_pin(range, gpio);
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;
int i;
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_maps(maps_node, i, 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) {
pinctrl_free(p, false);
mutex_unlock(&pinctrl_maps_mutex);
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);
/**
* 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, *setting2;
struct pinctrl_state *old_state = p->state;
int ret;
if (p->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.
*/
list_for_each_entry(setting, &p->state->settings, node) {
if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
continue;
pinmux_disable_setting(setting);
}
}
p->state = NULL;
/* Apply all the settings for the new state */
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 = pinconf_apply_setting(setting);
break;
default:
ret = -EINVAL;
break;
}
if (ret < 0) {
goto unapply_new_state;
}
}
p->state = state;
return 0;
unapply_new_state:
dev_err(p->dev, "Error applying setting, reverse things back\n");
list_for_each_entry(setting2, &state->settings, node) {
if (&setting2->node == &setting->node)
break;
/*
* 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.
*/
if (setting2->type == PIN_MAP_TYPE_MUX_GROUP)
pinmux_disable_setting(setting2);
}
/* 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);
}
/**
* struct 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);
int pinctrl_register_map(const struct pinctrl_map *maps, unsigned num_maps,
bool dup)
{
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->num_maps = num_maps;
if (dup) {
maps_node->maps = kmemdup(maps, sizeof(*maps) * num_maps,
GFP_KERNEL);
if (!maps_node->maps) {
kfree(maps_node);
return -ENOMEM;
}
} else {
maps_node->maps = maps;
}
mutex_lock(&pinctrl_maps_mutex);
list_add_tail(&maps_node->node, &pinctrl_maps);
mutex_unlock(&pinctrl_maps_mutex);
return 0;
}
/**
* pinctrl_register_mappings() - register a set of pin controller mappings
* @maps: the pincontrol mappings table to register. This should probably be
* marked with __initdata so it can be discarded after boot. This
* function will perform a shallow copy for the mapping entries.
* @num_maps: the number of maps in the mapping table
*/
int pinctrl_register_mappings(const struct pinctrl_map *maps,
unsigned num_maps)
{
return pinctrl_register_map(maps, num_maps, true);
}
void pinctrl_unregister_map(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);
}
/**
* 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;
}
#ifdef CONFIG_PM
/**
* pinctrl_pm_select_state() - select pinctrl state for PM
* @dev: device to select default state for
* @state: state to set
*/
static int pinctrl_pm_select_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_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)
{
if (!dev->pins)
return 0;
return pinctrl_pm_select_state(dev, dev->pins->default_state);
}
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_pm_select_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_pm_select_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 i, pin;
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);
/* 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;
}
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 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 *pins = NULL;
unsigned 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;
}
static int pinctrl_gpioranges_show(struct seq_file *s, void *what)
{
struct pinctrl_dev *pctldev = s->private;
struct pinctrl_gpio_range *range = NULL;
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;
}
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;
}
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;
int i;
const struct pinctrl_map *map;
seq_puts(s, "Pinctrl maps:\n");
mutex_lock(&pinctrl_maps_mutex);
for_each_maps(maps_node, i, 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;
}
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;
}
static int pinctrl_pins_open(struct inode *inode, struct file *file)
{
return single_open(file, pinctrl_pins_show, inode->i_private);
}
static int pinctrl_groups_open(struct inode *inode, struct file *file)
{
return single_open(file, pinctrl_groups_show, inode->i_private);
}
static int pinctrl_gpioranges_open(struct inode *inode, struct file *file)
{
return single_open(file, pinctrl_gpioranges_show, inode->i_private);
}
static int pinctrl_devices_open(struct inode *inode, struct file *file)
{
return single_open(file, pinctrl_devices_show, NULL);
}
static int pinctrl_maps_open(struct inode *inode, struct file *file)
{
return single_open(file, pinctrl_maps_show, NULL);
}
static int pinctrl_open(struct inode *inode, struct file *file)
{
return single_open(file, pinctrl_show, NULL);
}
static const struct file_operations pinctrl_pins_ops = {
.open = pinctrl_pins_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations pinctrl_groups_ops = {
.open = pinctrl_groups_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations pinctrl_gpioranges_ops = {
.open = pinctrl_gpioranges_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations pinctrl_devices_ops = {
.open = pinctrl_devices_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations pinctrl_maps_ops = {
.open = pinctrl_maps_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static const struct file_operations pinctrl_ops = {
.open = pinctrl_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static struct dentry *debugfs_root;
static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev)
{
struct dentry *device_root;
device_root = debugfs_create_dir(dev_name(pctldev->dev),
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", S_IFREG | S_IRUGO,
device_root, pctldev, &pinctrl_pins_ops);
debugfs_create_file("pingroups", S_IFREG | S_IRUGO,
device_root, pctldev, &pinctrl_groups_ops);
debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO,
device_root, pctldev, &pinctrl_gpioranges_ops);
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) || !debugfs_root) {
pr_warn("failed to create debugfs directory\n");
debugfs_root = NULL;
return;
}
debugfs_create_file("pinctrl-devices", S_IFREG | S_IRUGO,
debugfs_root, NULL, &pinctrl_devices_ops);
debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO,
debugfs_root, NULL, &pinctrl_maps_ops);
debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO,
debugfs_root, NULL, &pinctrl_ops);
}
#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(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 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);
}
kref_get(&pctldev->p->users);
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);
mutex_destroy(&pctldev->mutex);
kfree(pctldev);
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(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)
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(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,
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
*
* 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.
*/
int devm_pinctrl_register_and_init(struct device *dev,
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 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);