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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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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/consumer.h>#include <linux/gpio/driver.h>
#include <linux/pinctrl/consumer.h>#include <linux/pinctrl/devinfo.h>#include <linux/pinctrl/machine.h>#include <linux/pinctrl/pinconf.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;}EXPORT_SYMBOL_GPL(pinctrl_provide_dummies);
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_obj(*pindesc); 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_GPIOLIBstatic 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;}#elsestatic inline boolpinctrl_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 selector = 0; int ngroups;
if (!ops->get_groups_count || !ops->get_group_name) return -EINVAL;
ngroups = ops->get_groups_count(pctldev);
/* 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;}
#elsestatic 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 group_selector = 0; unsigned int ngroups;
if (!pctlops->get_groups_count || !pctlops->get_group_name) { dev_err(pctldev->dev, "does not support pin groups\n"); return -EINVAL; }
ngroups = pctlops->get_groups_count(pctldev);
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;}EXPORT_SYMBOL_GPL(pinctrl_get_group_selector);
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);
/** * pinctrl_gpio_get_config() - Get the config for a 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 query. On success it holds the result * Return: 0 on success, negative errno otherwise */int pinctrl_gpio_get_config(struct gpio_chip *gc, unsigned int offset, unsigned long *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 = pin_config_get_for_pin(pctldev, pin, config); mutex_unlock(&pctldev->mutex);
if (ret) return ret;
*config = pinconf_to_config_argument(*config); return 0;}EXPORT_SYMBOL_GPL(pinctrl_gpio_get_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_obj(*state); 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_obj(*setting); 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_obj(*p); 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_probe(p->dev, ret, "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(void *p){ pinctrl_put(p);}
/** * 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 *p; int ret;
p = pinctrl_get(dev); if (IS_ERR(p)) return p;
ret = devm_add_action_or_reset(dev, devm_pinctrl_release, p); if (ret) return ERR_PTR(ret);
return p;}EXPORT_SYMBOL_GPL(devm_pinctrl_get);
/** * 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){ devm_release_action(p->dev, devm_pinctrl_release, 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_obj(*maps_node); 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_init_state() - select init pinctrl state for PM * @dev: device to select init state for */int pinctrl_pm_select_init_state(struct device *dev){ if (!dev->pins) return 0;
return pinctrl_select_bound_state(dev, dev->pins->init_state);}EXPORT_SYMBOL_GPL(pinctrl_pm_select_init_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);
if (!ops->get_groups_count || !ops->get_group_name) { mutex_unlock(&pctldev->mutex); return 0; }
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_OR_NULL(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; const struct pinconf_ops *confops = pctldev->desc->confops; bool needs_groups = false;
if (!ops) return -EINVAL;
if (pctldev->desc->pmxops) needs_groups = true;
if (confops && (confops->pin_config_group_get || confops->pin_config_group_set)) needs_groups = true;
if (needs_groups && (!ops->get_groups_count || !ops->get_group_name)) { dev_err(pctldev->dev, "driver needs group callbacks for mux or group config\n"); 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_obj(*pctldev); 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) 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(void *pctldev){ pinctrl_unregister(pctldev);}
/** * 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 *pctldev; int ret;
pctldev = pinctrl_register(pctldesc, dev, driver_data); if (IS_ERR(pctldev)) return pctldev;
ret = devm_add_action_or_reset(dev, devm_pinctrl_dev_release, pctldev); if (ret) return ERR_PTR(ret);
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){ int error;
error = pinctrl_register_and_init(pctldesc, dev, driver_data, pctldev); if (error) return error;
return devm_add_action_or_reset(dev, devm_pinctrl_dev_release, *pctldev);}EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init);
static int __init pinctrl_init(void){ pr_debug("initialized pinctrl subsystem\n"); pinctrl_init_debugfs(); return 0;}
/* init early since many drivers really need to initialized pinmux early */core_initcall(pinctrl_init);