--- /dev/null
+/*
+ * 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 == NULL) {
+ 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 != NULL) {
+ 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,
+ unsigned number, const char *name)
+{
+ struct pin_desc *pindesc;
+
+ pindesc = pin_desc_get(pctldev, number);
+ if (pindesc != NULL) {
+ pr_err("pin %d already registered on %s\n", number,
+ pctldev->desc->name);
+ return -EINVAL;
+ }
+
+ pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL);
+ if (pindesc == NULL) {
+ dev_err(pctldev->dev, "failed to alloc struct pin_desc\n");
+ return -ENOMEM;
+ }
+
+ /* Set owner */
+ pindesc->pctldev = pctldev;
+
+ /* Copy basic pin info */
+ if (name) {
+ pindesc->name = name;
+ } else {
+ pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number);
+ if (pindesc->name == NULL) {
+ kfree(pindesc);
+ return -ENOMEM;
+ }
+ pindesc->dynamic_name = true;
+ }
+
+ radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc);
+ pr_debug("registered pin %d (%s) on %s\n",
+ number, pindesc->name, pctldev->desc->name);
+ return 0;
+}
+
+static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
+ struct pinctrl_pin_desc const *pins,
+ unsigned num_descs)
+{
+ unsigned i;
+ int ret = 0;
+
+ for (i = 0; i < num_descs; i++) {
+ ret = pinctrl_register_one_pin(pctldev,
+ pins[i].number, pins[i].name);
+ 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);
+
+ 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 != NULL) {
+ *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);
+
+/**
+ * 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);
+ /* 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)
+ goto out;
+ }
+ } else if (pin >= range->pin_base &&
+ pin < range->pin_base + range->npins)
+ goto out;
+ }
+ range = NULL;
+out:
+ mutex_unlock(&pctldev->mutex);
+ return range;
+}
+EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin);
+
+/**
+ * pinctrl_remove_gpio_range() - remove a range of GPIOs fro 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);
+
+/**
+ * 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_request_gpio() - request a single pin to be used in 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_request_gpio(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_request_gpio);
+
+/**
+ * pinctrl_free_gpio() - 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_free_gpio(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_free_gpio);
+
+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);
+
+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 == NULL) {
+ dev_err(p->dev,
+ "failed to alloc struct pinctrl_state\n");
+ 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_map const *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 == NULL) {
+ dev_err(p->dev,
+ "failed to alloc struct pinctrl_setting\n");
+ return -ENOMEM;
+ }
+
+ setting->type = map->type;
+
+ setting->pctldev = get_pinctrl_dev_from_devname(map->ctrl_dev_name);
+ if (setting->pctldev == NULL) {
+ 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 *p;
+ const char *devname;
+ struct pinctrl_maps *maps_node;
+ int i;
+ struct pinctrl_map const *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 == NULL) {
+ dev_err(dev, "failed to alloc struct pinctrl\n");
+ return ERR_PTR(-ENOMEM);
+ }
+ p->dev = dev;
+ INIT_LIST_HEAD(&p->states);
+ INIT_LIST_HEAD(&p->dt_maps);
+
+ ret = pinctrl_dt_to_map(p);
+ 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;
+
+ ret = add_setting(p, 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 occured, 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 != NULL) {
+ dev_dbg(dev, "obtain a copy of previously claimed pinctrl\n");
+ kref_get(&p->users);
+ return p;
+ }
+
+ return create_pinctrl(dev);
+}
+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_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)
+{
+ struct pinctrl_setting *setting, *setting2;
+ struct pinctrl_state *old_state = p->state;
+ int ret;
+
+ if (p->state == state)
+ return 0;
+
+ 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;
+}
+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(struct pinctrl_map const *maps, unsigned num_maps,
+ bool dup)
+{
+ int i, ret;
+ struct pinctrl_maps *maps_node;
+
+ pr_debug("add %d pinmux 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) {
+ pr_err("failed to alloc struct pinctrl_maps\n");
+ 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) {
+ pr_err("failed to duplicate mapping table\n");
+ 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(struct pinctrl_map const *maps,
+ unsigned num_maps)
+{
+ return pinctrl_register_map(maps, num_maps, true);
+}
+
+void pinctrl_unregister_map(struct pinctrl_map const *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_select_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_select_state(pctldev->p, pctldev->hog_default);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(pinctrl_force_default);
+
+#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 == NULL)
+ continue;
+
+ seq_printf(s, "pin %d (%s) ", pin,
+ desc->name ? desc->name : "unnamed");
+
+ /* 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;
+ struct pinctrl_map const *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_printf(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;
+
+ if (ops->dt_node_to_map && !ops->dt_free_map)
+ return -EINVAL;
+
+ return 0;
+}
+
+/**
+ * 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
+ */
+struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc,
+ struct device *dev, void *driver_data)
+{
+ struct pinctrl_dev *pctldev;
+ int ret;
+
+ if (!pctldesc)
+ return NULL;
+ if (!pctldesc->name)
+ return NULL;
+
+ pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL);
+ if (pctldev == NULL) {
+ dev_err(dev, "failed to alloc struct pinctrl_dev\n");
+ return NULL;
+ }
+
+ /* 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);
+ INIT_LIST_HEAD(&pctldev->gpio_ranges);
+ pctldev->dev = dev;
+ mutex_init(&pctldev->mutex);
+
+ /* check core ops for sanity */
+ if (pinctrl_check_ops(pctldev)) {
+ 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) {
+ if (pinmux_check_ops(pctldev))
+ goto out_err;
+ }
+
+ /* If we're implementing pinconfig, check the ops for sanity */
+ if (pctldesc->confops) {
+ if (pinconf_check_ops(pctldev))
+ 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;
+ }
+
+ mutex_lock(&pinctrldev_list_mutex);
+ list_add_tail(&pctldev->node, &pinctrldev_list);
+ mutex_unlock(&pinctrldev_list_mutex);
+
+ pctldev->p = pinctrl_get(pctldev->dev);
+
+ if (!IS_ERR(pctldev->p)) {
+ pctldev->hog_default =
+ pinctrl_lookup_state(pctldev->p, PINCTRL_STATE_DEFAULT);
+ if (IS_ERR(pctldev->hog_default)) {
+ dev_dbg(dev, "failed to lookup the default state\n");
+ } else {
+ if (pinctrl_select_state(pctldev->p,
+ pctldev->hog_default))
+ dev_err(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(dev, "failed to lookup the sleep state\n");
+ }
+
+ pinctrl_init_device_debugfs(pctldev);
+
+ return pctldev;
+
+out_err:
+ mutex_destroy(&pctldev->mutex);
+ kfree(pctldev);
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(pinctrl_register);
+
+/**
+ * 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 == NULL)
+ return;
+
+ mutex_lock(&pctldev->mutex);
+ pinctrl_remove_device_debugfs(pctldev);
+ mutex_unlock(&pctldev->mutex);
+
+ if (!IS_ERR(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);
+ /* 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 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);
Code Review / kvmfornfv.git / blobdiff