forked from Minki/linux
175ca83c0b
In unapply_new_state, the old state is re-applied, but p->state is not set back as it should. Signed-off-by: Richard Genoud <richard.genoud@gmail.com> Reviewed-by: Stephen Warren <swarren@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
1716 lines
42 KiB
C
1716 lines
42 KiB
C
/*
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* Core driver for the pin control subsystem
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*
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* Copyright (C) 2011-2012 ST-Ericsson SA
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* Written on behalf of Linaro for ST-Ericsson
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* Based on bits of regulator core, gpio core and clk core
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*
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* Author: Linus Walleij <linus.walleij@linaro.org>
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*
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* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved.
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*
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* License terms: GNU General Public License (GPL) version 2
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*/
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#define pr_fmt(fmt) "pinctrl core: " fmt
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#include <linux/kernel.h>
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#include <linux/kref.h>
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#include <linux/export.h>
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#include <linux/init.h>
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#include <linux/device.h>
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#include <linux/slab.h>
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#include <linux/err.h>
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#include <linux/list.h>
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#include <linux/sysfs.h>
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#include <linux/debugfs.h>
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#include <linux/seq_file.h>
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#include <linux/pinctrl/consumer.h>
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#include <linux/pinctrl/pinctrl.h>
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#include <linux/pinctrl/machine.h>
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#ifdef CONFIG_GPIOLIB
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#include <asm-generic/gpio.h>
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#endif
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#include "core.h"
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#include "devicetree.h"
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#include "pinmux.h"
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#include "pinconf.h"
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static bool pinctrl_dummy_state;
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/* Mutex taken by all entry points */
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DEFINE_MUTEX(pinctrl_mutex);
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/* Global list of pin control devices (struct pinctrl_dev) */
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LIST_HEAD(pinctrldev_list);
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/* List of pin controller handles (struct pinctrl) */
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static LIST_HEAD(pinctrl_list);
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/* List of pinctrl maps (struct pinctrl_maps) */
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LIST_HEAD(pinctrl_maps);
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/**
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* pinctrl_provide_dummies() - indicate if pinctrl provides dummy state support
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*
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* Usually this function is called by platforms without pinctrl driver support
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* but run with some shared drivers using pinctrl APIs.
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* After calling this function, the pinctrl core will return successfully
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* with creating a dummy state for the driver to keep going smoothly.
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*/
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void pinctrl_provide_dummies(void)
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{
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pinctrl_dummy_state = true;
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}
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const char *pinctrl_dev_get_name(struct pinctrl_dev *pctldev)
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{
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/* We're not allowed to register devices without name */
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return pctldev->desc->name;
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}
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EXPORT_SYMBOL_GPL(pinctrl_dev_get_name);
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const char *pinctrl_dev_get_devname(struct pinctrl_dev *pctldev)
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{
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return dev_name(pctldev->dev);
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}
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EXPORT_SYMBOL_GPL(pinctrl_dev_get_devname);
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void *pinctrl_dev_get_drvdata(struct pinctrl_dev *pctldev)
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{
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return pctldev->driver_data;
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}
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EXPORT_SYMBOL_GPL(pinctrl_dev_get_drvdata);
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/**
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* get_pinctrl_dev_from_devname() - look up pin controller device
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* @devname: the name of a device instance, as returned by dev_name()
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*
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* Looks up a pin control device matching a certain device name or pure device
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* pointer, the pure device pointer will take precedence.
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*/
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struct pinctrl_dev *get_pinctrl_dev_from_devname(const char *devname)
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{
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struct pinctrl_dev *pctldev = NULL;
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bool found = false;
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if (!devname)
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return NULL;
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list_for_each_entry(pctldev, &pinctrldev_list, node) {
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if (!strcmp(dev_name(pctldev->dev), devname)) {
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/* Matched on device name */
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found = true;
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break;
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}
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}
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return found ? pctldev : NULL;
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}
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/**
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* pin_get_from_name() - look up a pin number from a name
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* @pctldev: the pin control device to lookup the pin on
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* @name: the name of the pin to look up
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*/
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int pin_get_from_name(struct pinctrl_dev *pctldev, const char *name)
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{
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unsigned i, pin;
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/* The pin number can be retrived from the pin controller descriptor */
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for (i = 0; i < pctldev->desc->npins; i++) {
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struct pin_desc *desc;
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pin = pctldev->desc->pins[i].number;
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desc = pin_desc_get(pctldev, pin);
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/* Pin space may be sparse */
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if (desc == NULL)
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continue;
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if (desc->name && !strcmp(name, desc->name))
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return pin;
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}
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return -EINVAL;
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}
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/**
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* pin_get_name_from_id() - look up a pin name from a pin id
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* @pctldev: the pin control device to lookup the pin on
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* @name: the name of the pin to look up
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*/
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const char *pin_get_name(struct pinctrl_dev *pctldev, const unsigned pin)
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{
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const struct pin_desc *desc;
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desc = pin_desc_get(pctldev, pin);
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if (desc == NULL) {
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dev_err(pctldev->dev, "failed to get pin(%d) name\n",
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pin);
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return NULL;
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}
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return desc->name;
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}
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/**
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* pin_is_valid() - check if pin exists on controller
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* @pctldev: the pin control device to check the pin on
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* @pin: pin to check, use the local pin controller index number
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*
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* This tells us whether a certain pin exist on a certain pin controller or
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* not. Pin lists may be sparse, so some pins may not exist.
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*/
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bool pin_is_valid(struct pinctrl_dev *pctldev, int pin)
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{
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struct pin_desc *pindesc;
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if (pin < 0)
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return false;
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mutex_lock(&pinctrl_mutex);
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pindesc = pin_desc_get(pctldev, pin);
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mutex_unlock(&pinctrl_mutex);
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return pindesc != NULL;
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}
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EXPORT_SYMBOL_GPL(pin_is_valid);
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/* Deletes a range of pin descriptors */
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static void pinctrl_free_pindescs(struct pinctrl_dev *pctldev,
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const struct pinctrl_pin_desc *pins,
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unsigned num_pins)
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{
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int i;
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for (i = 0; i < num_pins; i++) {
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struct pin_desc *pindesc;
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pindesc = radix_tree_lookup(&pctldev->pin_desc_tree,
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pins[i].number);
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if (pindesc != NULL) {
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radix_tree_delete(&pctldev->pin_desc_tree,
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pins[i].number);
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if (pindesc->dynamic_name)
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kfree(pindesc->name);
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}
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kfree(pindesc);
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}
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}
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static int pinctrl_register_one_pin(struct pinctrl_dev *pctldev,
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unsigned number, const char *name)
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{
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struct pin_desc *pindesc;
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pindesc = pin_desc_get(pctldev, number);
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if (pindesc != NULL) {
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pr_err("pin %d already registered on %s\n", number,
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pctldev->desc->name);
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return -EINVAL;
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}
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pindesc = kzalloc(sizeof(*pindesc), GFP_KERNEL);
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if (pindesc == NULL) {
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dev_err(pctldev->dev, "failed to alloc struct pin_desc\n");
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return -ENOMEM;
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}
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/* Set owner */
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pindesc->pctldev = pctldev;
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/* Copy basic pin info */
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if (name) {
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pindesc->name = name;
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} else {
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pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", number);
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if (pindesc->name == NULL) {
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kfree(pindesc);
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return -ENOMEM;
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}
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pindesc->dynamic_name = true;
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}
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radix_tree_insert(&pctldev->pin_desc_tree, number, pindesc);
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pr_debug("registered pin %d (%s) on %s\n",
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number, pindesc->name, pctldev->desc->name);
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return 0;
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}
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static int pinctrl_register_pins(struct pinctrl_dev *pctldev,
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struct pinctrl_pin_desc const *pins,
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unsigned num_descs)
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{
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unsigned i;
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int ret = 0;
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for (i = 0; i < num_descs; i++) {
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ret = pinctrl_register_one_pin(pctldev,
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pins[i].number, pins[i].name);
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if (ret)
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return ret;
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}
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return 0;
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}
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/**
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* pinctrl_match_gpio_range() - check if a certain GPIO pin is in range
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* @pctldev: pin controller device to check
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* @gpio: gpio pin to check taken from the global GPIO pin space
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*
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* Tries to match a GPIO pin number to the ranges handled by a certain pin
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* controller, return the range or NULL
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*/
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static struct pinctrl_gpio_range *
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pinctrl_match_gpio_range(struct pinctrl_dev *pctldev, unsigned gpio)
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{
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struct pinctrl_gpio_range *range = NULL;
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/* Loop over the ranges */
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list_for_each_entry(range, &pctldev->gpio_ranges, node) {
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/* Check if we're in the valid range */
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if (gpio >= range->base &&
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gpio < range->base + range->npins) {
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return range;
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}
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}
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return NULL;
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}
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/**
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* pinctrl_ready_for_gpio_range() - check if other GPIO pins of
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* the same GPIO chip are in range
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* @gpio: gpio pin to check taken from the global GPIO pin space
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*
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* This function is complement of pinctrl_match_gpio_range(). If the return
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* value of pinctrl_match_gpio_range() is NULL, this function could be used
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* to check whether pinctrl device is ready or not. Maybe some GPIO pins
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* of the same GPIO chip don't have back-end pinctrl interface.
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* If the return value is true, it means that pinctrl device is ready & the
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* certain GPIO pin doesn't have back-end pinctrl device. If the return value
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* is false, it means that pinctrl device may not be ready.
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*/
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#ifdef CONFIG_GPIOLIB
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static bool pinctrl_ready_for_gpio_range(unsigned gpio)
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{
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struct pinctrl_dev *pctldev;
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struct pinctrl_gpio_range *range = NULL;
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struct gpio_chip *chip = gpio_to_chip(gpio);
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/* Loop over the pin controllers */
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list_for_each_entry(pctldev, &pinctrldev_list, node) {
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/* Loop over the ranges */
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list_for_each_entry(range, &pctldev->gpio_ranges, node) {
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/* Check if any gpio range overlapped with gpio chip */
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if (range->base + range->npins - 1 < chip->base ||
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range->base > chip->base + chip->ngpio - 1)
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continue;
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return true;
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}
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}
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return false;
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}
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#else
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static bool pinctrl_ready_for_gpio_range(unsigned gpio) { return true; }
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#endif
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/**
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* pinctrl_get_device_gpio_range() - find device for GPIO range
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* @gpio: the pin to locate the pin controller for
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* @outdev: the pin control device if found
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* @outrange: the GPIO range if found
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*
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* Find the pin controller handling a certain GPIO pin from the pinspace of
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* the GPIO subsystem, return the device and the matching GPIO range. Returns
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* -EPROBE_DEFER if the GPIO range could not be found in any device since it
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* may still have not been registered.
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*/
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static int pinctrl_get_device_gpio_range(unsigned gpio,
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struct pinctrl_dev **outdev,
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struct pinctrl_gpio_range **outrange)
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{
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struct pinctrl_dev *pctldev = NULL;
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/* Loop over the pin controllers */
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list_for_each_entry(pctldev, &pinctrldev_list, node) {
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struct pinctrl_gpio_range *range;
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range = pinctrl_match_gpio_range(pctldev, gpio);
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if (range != NULL) {
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*outdev = pctldev;
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*outrange = range;
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return 0;
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}
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}
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return -EPROBE_DEFER;
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}
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/**
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* pinctrl_add_gpio_range() - register a GPIO range for a controller
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* @pctldev: pin controller device to add the range to
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* @range: the GPIO range to add
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*
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* This adds a range of GPIOs to be handled by a certain pin controller. Call
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* this to register handled ranges after registering your pin controller.
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*/
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void pinctrl_add_gpio_range(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range)
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{
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mutex_lock(&pinctrl_mutex);
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list_add_tail(&range->node, &pctldev->gpio_ranges);
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mutex_unlock(&pinctrl_mutex);
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}
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EXPORT_SYMBOL_GPL(pinctrl_add_gpio_range);
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void pinctrl_add_gpio_ranges(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *ranges,
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unsigned nranges)
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{
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int i;
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for (i = 0; i < nranges; i++)
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pinctrl_add_gpio_range(pctldev, &ranges[i]);
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}
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EXPORT_SYMBOL_GPL(pinctrl_add_gpio_ranges);
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struct pinctrl_dev *pinctrl_find_and_add_gpio_range(const char *devname,
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struct pinctrl_gpio_range *range)
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{
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struct pinctrl_dev *pctldev = get_pinctrl_dev_from_devname(devname);
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/*
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* If we can't find this device, let's assume that is because
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* it has not probed yet, so the driver trying to register this
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* range need to defer probing.
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*/
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if (!pctldev)
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return ERR_PTR(-EPROBE_DEFER);
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pinctrl_add_gpio_range(pctldev, range);
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return pctldev;
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}
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EXPORT_SYMBOL_GPL(pinctrl_find_and_add_gpio_range);
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/**
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* pinctrl_find_gpio_range_from_pin() - locate the GPIO range for a pin
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* @pctldev: the pin controller device to look in
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* @pin: a controller-local number to find the range for
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*/
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struct pinctrl_gpio_range *
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pinctrl_find_gpio_range_from_pin(struct pinctrl_dev *pctldev,
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unsigned int pin)
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{
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struct pinctrl_gpio_range *range = NULL;
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/* Loop over the ranges */
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list_for_each_entry(range, &pctldev->gpio_ranges, node) {
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/* Check if we're in the valid range */
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if (pin >= range->pin_base &&
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pin < range->pin_base + range->npins) {
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return range;
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}
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}
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return NULL;
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}
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EXPORT_SYMBOL_GPL(pinctrl_find_gpio_range_from_pin);
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/**
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* pinctrl_remove_gpio_range() - remove a range of GPIOs fro a pin controller
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* @pctldev: pin controller device to remove the range from
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* @range: the GPIO range to remove
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*/
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void pinctrl_remove_gpio_range(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range)
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{
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mutex_lock(&pinctrl_mutex);
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list_del(&range->node);
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mutex_unlock(&pinctrl_mutex);
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}
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EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range);
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/**
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* pinctrl_get_group_selector() - returns the group selector for a group
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* @pctldev: the pin controller handling the group
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* @pin_group: the pin group to look up
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*/
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int pinctrl_get_group_selector(struct pinctrl_dev *pctldev,
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const char *pin_group)
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{
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const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
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unsigned ngroups = pctlops->get_groups_count(pctldev);
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unsigned group_selector = 0;
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while (group_selector < ngroups) {
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const char *gname = pctlops->get_group_name(pctldev,
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group_selector);
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if (!strcmp(gname, pin_group)) {
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dev_dbg(pctldev->dev,
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"found group selector %u for %s\n",
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group_selector,
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pin_group);
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return group_selector;
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}
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group_selector++;
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}
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dev_err(pctldev->dev, "does not have pin group %s\n",
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pin_group);
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return -EINVAL;
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}
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/**
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* pinctrl_request_gpio() - request a single pin to be used in as GPIO
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* @gpio: the GPIO pin number from the GPIO subsystem number space
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*
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* This function should *ONLY* be used from gpiolib-based GPIO drivers,
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* as part of their gpio_request() semantics, platforms and individual drivers
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* shall *NOT* request GPIO pins to be muxed in.
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*/
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int pinctrl_request_gpio(unsigned gpio)
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{
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struct pinctrl_dev *pctldev;
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struct pinctrl_gpio_range *range;
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int ret;
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int pin;
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mutex_lock(&pinctrl_mutex);
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ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
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if (ret) {
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if (pinctrl_ready_for_gpio_range(gpio))
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ret = 0;
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mutex_unlock(&pinctrl_mutex);
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return ret;
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}
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/* Convert to the pin controllers number space */
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pin = gpio - range->base + range->pin_base;
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ret = pinmux_request_gpio(pctldev, range, pin, gpio);
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mutex_unlock(&pinctrl_mutex);
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return ret;
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}
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EXPORT_SYMBOL_GPL(pinctrl_request_gpio);
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/**
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* 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;
|
|
|
|
mutex_lock(&pinctrl_mutex);
|
|
|
|
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range);
|
|
if (ret) {
|
|
mutex_unlock(&pinctrl_mutex);
|
|
return;
|
|
}
|
|
|
|
/* Convert to the pin controllers number space */
|
|
pin = gpio - range->base + range->pin_base;
|
|
|
|
pinmux_free_gpio(pctldev, pin, range);
|
|
|
|
mutex_unlock(&pinctrl_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;
|
|
|
|
/* Convert to the pin controllers number space */
|
|
pin = gpio - range->base + range->pin_base;
|
|
|
|
return pinmux_gpio_direction(pctldev, range, pin, input);
|
|
}
|
|
|
|
/**
|
|
* 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)
|
|
{
|
|
int ret;
|
|
mutex_lock(&pinctrl_mutex);
|
|
ret = pinctrl_gpio_direction(gpio, true);
|
|
mutex_unlock(&pinctrl_mutex);
|
|
return ret;
|
|
}
|
|
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)
|
|
{
|
|
int ret;
|
|
mutex_lock(&pinctrl_mutex);
|
|
ret = pinctrl_gpio_direction(gpio, false);
|
|
mutex_unlock(&pinctrl_mutex);
|
|
return ret;
|
|
}
|
|
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;
|
|
|
|
list_for_each_entry(p, &pinctrl_list, node)
|
|
if (p->dev == dev)
|
|
return p;
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void pinctrl_put_locked(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);
|
|
|
|
/* 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_put_locked(p, false);
|
|
return ERR_PTR(ret);
|
|
}
|
|
}
|
|
if (ret < 0) {
|
|
/* If some other error than deferral occured, return here */
|
|
pinctrl_put_locked(p, false);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
kref_init(&p->users);
|
|
|
|
/* Add the pinctrl handle to the global list */
|
|
list_add_tail(&p->node, &pinctrl_list);
|
|
|
|
return p;
|
|
}
|
|
|
|
static struct pinctrl *pinctrl_get_locked(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);
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
|
|
mutex_lock(&pinctrl_mutex);
|
|
p = pinctrl_get_locked(dev);
|
|
mutex_unlock(&pinctrl_mutex);
|
|
|
|
return p;
|
|
}
|
|
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_put_locked(struct pinctrl *p, bool inlist)
|
|
{
|
|
struct pinctrl_state *state, *n1;
|
|
struct pinctrl_setting *setting, *n2;
|
|
|
|
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);
|
|
}
|
|
|
|
/**
|
|
* 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_put_locked(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)
|
|
{
|
|
mutex_lock(&pinctrl_mutex);
|
|
kref_put(&p->users, pinctrl_release);
|
|
mutex_unlock(&pinctrl_mutex);
|
|
}
|
|
EXPORT_SYMBOL_GPL(pinctrl_put);
|
|
|
|
static struct pinctrl_state *pinctrl_lookup_state_locked(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;
|
|
}
|
|
|
|
/**
|
|
* 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 *s;
|
|
|
|
mutex_lock(&pinctrl_mutex);
|
|
s = pinctrl_lookup_state_locked(p, name);
|
|
mutex_unlock(&pinctrl_mutex);
|
|
|
|
return s;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pinctrl_lookup_state);
|
|
|
|
static int pinctrl_select_state_locked(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) {
|
|
/*
|
|
* The set of groups with a mux configuration in the old state
|
|
* may not be identical to the set of groups with a mux setting
|
|
* in the new state. While this might be unusual, it's entirely
|
|
* possible for the "user"-supplied mapping table to be written
|
|
* that way. For each group that was configured in the old state
|
|
* but not in the new state, this code puts that group into a
|
|
* safe/disabled state.
|
|
*/
|
|
list_for_each_entry(setting, &p->state->settings, node) {
|
|
bool found = false;
|
|
if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
|
|
continue;
|
|
list_for_each_entry(setting2, &state->settings, node) {
|
|
if (setting2->type != PIN_MAP_TYPE_MUX_GROUP)
|
|
continue;
|
|
if (setting2->data.mux.group ==
|
|
setting->data.mux.group) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!found)
|
|
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;
|
|
pinctrl_free_setting(true, setting2);
|
|
}
|
|
|
|
if (old_state) {
|
|
list_for_each_entry(setting, &old_state->settings, node) {
|
|
bool found = false;
|
|
if (setting->type != PIN_MAP_TYPE_MUX_GROUP)
|
|
continue;
|
|
list_for_each_entry(setting2, &state->settings, node) {
|
|
if (setting2->type != PIN_MAP_TYPE_MUX_GROUP)
|
|
continue;
|
|
if (setting2->data.mux.group ==
|
|
setting->data.mux.group) {
|
|
found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (!found)
|
|
pinmux_enable_setting(setting);
|
|
}
|
|
}
|
|
|
|
p->state = old_state;
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* pinctrl_select() - select/activate/program a pinctrl state to HW
|
|
* @p: the pinctrl handle for the device that requests configuratio
|
|
* @state: the state handle to select/activate/program
|
|
*/
|
|
int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&pinctrl_mutex);
|
|
ret = pinctrl_select_state_locked(p, state);
|
|
mutex_unlock(&pinctrl_mutex);
|
|
|
|
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, bool locked)
|
|
{
|
|
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;
|
|
}
|
|
|
|
if (!locked)
|
|
mutex_lock(&pinctrl_mutex);
|
|
list_add_tail(&maps_node->node, &pinctrl_maps);
|
|
if (!locked)
|
|
mutex_unlock(&pinctrl_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, false);
|
|
}
|
|
|
|
void pinctrl_unregister_map(struct pinctrl_map const *map)
|
|
{
|
|
struct pinctrl_maps *maps_node;
|
|
|
|
list_for_each_entry(maps_node, &pinctrl_maps, node) {
|
|
if (maps_node->maps == map) {
|
|
list_del(&maps_node->node);
|
|
return;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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_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(&pinctrl_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(&pinctrl_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;
|
|
|
|
ngroups = ops->get_groups_count(pctldev);
|
|
mutex_lock(&pinctrl_mutex);
|
|
|
|
seq_puts(s, "registered pin groups:\n");
|
|
while (selector < ngroups) {
|
|
const unsigned *pins;
|
|
unsigned num_pins;
|
|
const char *gname = ops->get_group_name(pctldev, selector);
|
|
const char *pname;
|
|
int ret;
|
|
int i;
|
|
|
|
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(&pinctrl_mutex);
|
|
return -EINVAL;
|
|
}
|
|
seq_printf(s, "pin %d (%s)\n", pins[i], pname);
|
|
}
|
|
seq_puts(s, "\n");
|
|
}
|
|
selector++;
|
|
}
|
|
|
|
mutex_unlock(&pinctrl_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(&pinctrl_mutex);
|
|
|
|
/* Loop over the ranges */
|
|
list_for_each_entry(range, &pctldev->gpio_ranges, node) {
|
|
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(&pinctrl_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(&pinctrl_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(&pinctrl_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_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_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_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_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);
|
|
pinmux_init_device_debugfs(device_root, pctldev);
|
|
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 ||
|
|
!ops->get_group_pins)
|
|
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;
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|
pctldev->desc = pctldesc;
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|
pctldev->driver_data = driver_data;
|
|
INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL);
|
|
INIT_LIST_HEAD(&pctldev->gpio_ranges);
|
|
pctldev->dev = dev;
|
|
|
|
/* 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(&pinctrl_mutex);
|
|
|
|
list_add_tail(&pctldev->node, &pinctrldev_list);
|
|
|
|
pctldev->p = pinctrl_get_locked(pctldev->dev);
|
|
if (!IS_ERR(pctldev->p)) {
|
|
pctldev->hog_default =
|
|
pinctrl_lookup_state_locked(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_locked(pctldev->p,
|
|
pctldev->hog_default))
|
|
dev_err(dev,
|
|
"failed to select default state\n");
|
|
}
|
|
|
|
pctldev->hog_sleep =
|
|
pinctrl_lookup_state_locked(pctldev->p,
|
|
PINCTRL_STATE_SLEEP);
|
|
if (IS_ERR(pctldev->hog_sleep))
|
|
dev_dbg(dev, "failed to lookup the sleep state\n");
|
|
}
|
|
|
|
mutex_unlock(&pinctrl_mutex);
|
|
|
|
pinctrl_init_device_debugfs(pctldev);
|
|
|
|
return pctldev;
|
|
|
|
out_err:
|
|
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;
|
|
|
|
pinctrl_remove_device_debugfs(pctldev);
|
|
|
|
mutex_lock(&pinctrl_mutex);
|
|
|
|
if (!IS_ERR(pctldev->p))
|
|
pinctrl_put_locked(pctldev->p, true);
|
|
|
|
/* 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);
|
|
|
|
kfree(pctldev);
|
|
|
|
mutex_unlock(&pinctrl_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);
|