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2305 lines
57 KiB
2305 lines
57 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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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 <[email protected]> |
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* |
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* Copyright (C) 2012 NVIDIA CORPORATION. All rights reserved. |
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*/ |
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#define pr_fmt(fmt) "pinctrl core: " fmt |
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|
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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/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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|
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#ifdef CONFIG_GPIOLIB |
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#include "../gpio/gpiolib.h" |
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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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|
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/* Mutex taken to protect pinctrl_list */ |
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static DEFINE_MUTEX(pinctrl_list_mutex); |
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|
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/* Mutex taken to protect pinctrl_maps */ |
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DEFINE_MUTEX(pinctrl_maps_mutex); |
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/* Mutex taken to protect pinctrldev_list */ |
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static DEFINE_MUTEX(pinctrldev_list_mutex); |
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|
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/* Global list of pin control devices (struct pinctrl_dev) */ |
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static LIST_HEAD(pinctrldev_list); |
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|
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/* List of pin controller handles (struct pinctrl) */ |
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static LIST_HEAD(pinctrl_list); |
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|
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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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|
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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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/** |
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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; |
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|
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if (!devname) |
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return NULL; |
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mutex_lock(&pinctrldev_list_mutex); |
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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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mutex_unlock(&pinctrldev_list_mutex); |
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return pctldev; |
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} |
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} |
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mutex_unlock(&pinctrldev_list_mutex); |
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return NULL; |
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} |
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struct pinctrl_dev *get_pinctrl_dev_from_of_node(struct device_node *np) |
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{ |
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struct pinctrl_dev *pctldev; |
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mutex_lock(&pinctrldev_list_mutex); |
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list_for_each_entry(pctldev, &pinctrldev_list, node) |
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if (pctldev->dev->of_node == np) { |
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mutex_unlock(&pinctrldev_list_mutex); |
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return pctldev; |
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} |
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mutex_unlock(&pinctrldev_list_mutex); |
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return 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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|
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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 && !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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* @pin: pin number/id 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) { |
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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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EXPORT_SYMBOL_GPL(pin_get_name); |
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|
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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) { |
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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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const struct pinctrl_pin_desc *pin) |
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{ |
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struct pin_desc *pindesc; |
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pindesc = pin_desc_get(pctldev, pin->number); |
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if (pindesc) { |
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dev_err(pctldev->dev, "pin %d already registered\n", |
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pin->number); |
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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) |
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return -ENOMEM; |
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/* Set owner */ |
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pindesc->pctldev = pctldev; |
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|
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/* Copy basic pin info */ |
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if (pin->name) { |
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pindesc->name = pin->name; |
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} else { |
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pindesc->name = kasprintf(GFP_KERNEL, "PIN%u", pin->number); |
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if (!pindesc->name) { |
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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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pindesc->drv_data = pin->drv_data; |
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radix_tree_insert(&pctldev->pin_desc_tree, pin->number, pindesc); |
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pr_debug("registered pin %d (%s) on %s\n", |
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pin->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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const struct pinctrl_pin_desc *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, &pins[i]); |
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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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/** |
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* gpio_to_pin() - GPIO range GPIO number to pin number translation |
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* @range: GPIO range used for the translation |
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* @gpio: gpio pin to translate to a pin number |
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* |
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* Finds the pin number for a given GPIO using the specified GPIO range |
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* as a base for translation. The distinction between linear GPIO ranges |
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* and pin list based GPIO ranges is managed correctly by this function. |
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* |
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* This function assumes the gpio is part of the specified GPIO range, use |
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* only after making sure this is the case (e.g. by calling it on the |
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* result of successful pinctrl_get_device_gpio_range calls)! |
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*/ |
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static inline int gpio_to_pin(struct pinctrl_gpio_range *range, |
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unsigned int gpio) |
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{ |
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unsigned int offset = gpio - range->base; |
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if (range->pins) |
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return range->pins[offset]; |
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else |
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return range->pin_base + offset; |
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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; |
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mutex_lock(&pctldev->mutex); |
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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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mutex_unlock(&pctldev->mutex); |
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return range; |
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} |
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} |
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mutex_unlock(&pctldev->mutex); |
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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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if (WARN(!chip, "no gpio_chip for gpio%i?", gpio)) |
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return false; |
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mutex_lock(&pinctrldev_list_mutex); |
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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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mutex_lock(&pctldev->mutex); |
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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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mutex_unlock(&pctldev->mutex); |
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mutex_unlock(&pinctrldev_list_mutex); |
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return true; |
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} |
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mutex_unlock(&pctldev->mutex); |
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} |
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mutex_unlock(&pinctrldev_list_mutex); |
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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; |
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mutex_lock(&pinctrldev_list_mutex); |
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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) { |
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*outdev = pctldev; |
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*outrange = range; |
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mutex_unlock(&pinctrldev_list_mutex); |
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return 0; |
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} |
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} |
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mutex_unlock(&pinctrldev_list_mutex); |
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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(&pctldev->mutex); |
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list_add_tail(&range->node, &pctldev->gpio_ranges); |
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mutex_unlock(&pctldev->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; |
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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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} |
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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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int pinctrl_get_group_pins(struct pinctrl_dev *pctldev, const char *pin_group, |
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const unsigned **pins, unsigned *num_pins) |
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{ |
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const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; |
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int gs; |
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if (!pctlops->get_group_pins) |
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return -EINVAL; |
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gs = pinctrl_get_group_selector(pctldev, pin_group); |
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if (gs < 0) |
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return gs; |
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return pctlops->get_group_pins(pctldev, gs, pins, num_pins); |
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} |
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EXPORT_SYMBOL_GPL(pinctrl_get_group_pins); |
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struct pinctrl_gpio_range * |
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pinctrl_find_gpio_range_from_pin_nolock(struct pinctrl_dev *pctldev, |
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unsigned int pin) |
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{ |
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struct pinctrl_gpio_range *range; |
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|
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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 (range->pins) { |
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int a; |
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for (a = 0; a < range->npins; a++) { |
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if (range->pins[a] == pin) |
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return range; |
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} |
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} else 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_nolock); |
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|
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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; |
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|
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mutex_lock(&pctldev->mutex); |
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range = pinctrl_find_gpio_range_from_pin_nolock(pctldev, pin); |
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mutex_unlock(&pctldev->mutex); |
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|
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return range; |
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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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/** |
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* pinctrl_remove_gpio_range() - remove a range of GPIOs from 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(&pctldev->mutex); |
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list_del(&range->node); |
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mutex_unlock(&pctldev->mutex); |
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} |
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EXPORT_SYMBOL_GPL(pinctrl_remove_gpio_range); |
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|
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#ifdef CONFIG_GENERIC_PINCTRL_GROUPS |
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|
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/** |
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* pinctrl_generic_get_group_count() - returns the number of pin groups |
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* @pctldev: pin controller device |
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*/ |
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int pinctrl_generic_get_group_count(struct pinctrl_dev *pctldev) |
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{ |
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return pctldev->num_groups; |
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} |
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EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_count); |
|
|
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/** |
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* pinctrl_generic_get_group_name() - returns the name of a pin group |
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* @pctldev: pin controller device |
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* @selector: group number |
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*/ |
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const char *pinctrl_generic_get_group_name(struct pinctrl_dev *pctldev, |
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unsigned int selector) |
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{ |
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struct group_desc *group; |
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|
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group = radix_tree_lookup(&pctldev->pin_group_tree, |
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selector); |
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if (!group) |
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return NULL; |
|
|
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return group->name; |
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} |
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EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_name); |
|
|
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/** |
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* pinctrl_generic_get_group_pins() - gets the pin group pins |
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* @pctldev: pin controller device |
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* @selector: group number |
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* @pins: pins in the group |
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* @num_pins: number of pins in the group |
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*/ |
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int pinctrl_generic_get_group_pins(struct pinctrl_dev *pctldev, |
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unsigned int selector, |
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const unsigned int **pins, |
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unsigned int *num_pins) |
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{ |
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struct group_desc *group; |
|
|
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group = radix_tree_lookup(&pctldev->pin_group_tree, |
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selector); |
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if (!group) { |
|
dev_err(pctldev->dev, "%s could not find pingroup%i\n", |
|
__func__, selector); |
|
return -EINVAL; |
|
} |
|
|
|
*pins = group->pins; |
|
*num_pins = group->num_pins; |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_generic_get_group_pins); |
|
|
|
/** |
|
* pinctrl_generic_get_group() - returns a pin group based on the number |
|
* @pctldev: pin controller device |
|
* @selector: group number |
|
*/ |
|
struct group_desc *pinctrl_generic_get_group(struct pinctrl_dev *pctldev, |
|
unsigned int selector) |
|
{ |
|
struct group_desc *group; |
|
|
|
group = radix_tree_lookup(&pctldev->pin_group_tree, |
|
selector); |
|
if (!group) |
|
return NULL; |
|
|
|
return group; |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_generic_get_group); |
|
|
|
static int pinctrl_generic_group_name_to_selector(struct pinctrl_dev *pctldev, |
|
const char *function) |
|
{ |
|
const struct pinctrl_ops *ops = pctldev->desc->pctlops; |
|
int ngroups = ops->get_groups_count(pctldev); |
|
int selector = 0; |
|
|
|
/* See if this pctldev has this group */ |
|
while (selector < ngroups) { |
|
const char *gname = ops->get_group_name(pctldev, selector); |
|
|
|
if (gname && !strcmp(function, gname)) |
|
return selector; |
|
|
|
selector++; |
|
} |
|
|
|
return -EINVAL; |
|
} |
|
|
|
/** |
|
* pinctrl_generic_add_group() - adds a new pin group |
|
* @pctldev: pin controller device |
|
* @name: name of the pin group |
|
* @pins: pins in the pin group |
|
* @num_pins: number of pins in the pin group |
|
* @data: pin controller driver specific data |
|
* |
|
* Note that the caller must take care of locking. |
|
*/ |
|
int pinctrl_generic_add_group(struct pinctrl_dev *pctldev, const char *name, |
|
int *pins, int num_pins, void *data) |
|
{ |
|
struct group_desc *group; |
|
int selector; |
|
|
|
if (!name) |
|
return -EINVAL; |
|
|
|
selector = pinctrl_generic_group_name_to_selector(pctldev, name); |
|
if (selector >= 0) |
|
return selector; |
|
|
|
selector = pctldev->num_groups; |
|
|
|
group = devm_kzalloc(pctldev->dev, sizeof(*group), GFP_KERNEL); |
|
if (!group) |
|
return -ENOMEM; |
|
|
|
group->name = name; |
|
group->pins = pins; |
|
group->num_pins = num_pins; |
|
group->data = data; |
|
|
|
radix_tree_insert(&pctldev->pin_group_tree, selector, group); |
|
|
|
pctldev->num_groups++; |
|
|
|
return selector; |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_generic_add_group); |
|
|
|
/** |
|
* pinctrl_generic_remove_group() - removes a numbered pin group |
|
* @pctldev: pin controller device |
|
* @selector: group number |
|
* |
|
* Note that the caller must take care of locking. |
|
*/ |
|
int pinctrl_generic_remove_group(struct pinctrl_dev *pctldev, |
|
unsigned int selector) |
|
{ |
|
struct group_desc *group; |
|
|
|
group = radix_tree_lookup(&pctldev->pin_group_tree, |
|
selector); |
|
if (!group) |
|
return -ENOENT; |
|
|
|
radix_tree_delete(&pctldev->pin_group_tree, selector); |
|
devm_kfree(pctldev->dev, group); |
|
|
|
pctldev->num_groups--; |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_generic_remove_group); |
|
|
|
/** |
|
* pinctrl_generic_free_groups() - removes all pin groups |
|
* @pctldev: pin controller device |
|
* |
|
* Note that the caller must take care of locking. The pinctrl groups |
|
* are allocated with devm_kzalloc() so no need to free them here. |
|
*/ |
|
static void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev) |
|
{ |
|
struct radix_tree_iter iter; |
|
void __rcu **slot; |
|
|
|
radix_tree_for_each_slot(slot, &pctldev->pin_group_tree, &iter, 0) |
|
radix_tree_delete(&pctldev->pin_group_tree, iter.index); |
|
|
|
pctldev->num_groups = 0; |
|
} |
|
|
|
#else |
|
static inline void pinctrl_generic_free_groups(struct pinctrl_dev *pctldev) |
|
{ |
|
} |
|
#endif /* CONFIG_GENERIC_PINCTRL_GROUPS */ |
|
|
|
/** |
|
* pinctrl_get_group_selector() - returns the group selector for a group |
|
* @pctldev: the pin controller handling the group |
|
* @pin_group: the pin group to look up |
|
*/ |
|
int pinctrl_get_group_selector(struct pinctrl_dev *pctldev, |
|
const char *pin_group) |
|
{ |
|
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops; |
|
unsigned 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 (gname && !strcmp(gname, pin_group)) { |
|
dev_dbg(pctldev->dev, |
|
"found group selector %u for %s\n", |
|
group_selector, |
|
pin_group); |
|
return group_selector; |
|
} |
|
|
|
group_selector++; |
|
} |
|
|
|
dev_err(pctldev->dev, "does not have pin group %s\n", |
|
pin_group); |
|
|
|
return -EINVAL; |
|
} |
|
|
|
bool pinctrl_gpio_can_use_line(unsigned gpio) |
|
{ |
|
struct pinctrl_dev *pctldev; |
|
struct pinctrl_gpio_range *range; |
|
bool result; |
|
int pin; |
|
|
|
/* |
|
* Try to obtain GPIO range, if it fails |
|
* we're probably dealing with GPIO driver |
|
* without a backing pin controller - bail out. |
|
*/ |
|
if (pinctrl_get_device_gpio_range(gpio, &pctldev, &range)) |
|
return true; |
|
|
|
mutex_lock(&pctldev->mutex); |
|
|
|
/* Convert to the pin controllers number space */ |
|
pin = gpio_to_pin(range, gpio); |
|
|
|
result = pinmux_can_be_used_for_gpio(pctldev, pin); |
|
|
|
mutex_unlock(&pctldev->mutex); |
|
|
|
return result; |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_gpio_can_use_line); |
|
|
|
/** |
|
* pinctrl_gpio_request() - request a single pin to be used as GPIO |
|
* @gpio: the GPIO pin number from the GPIO subsystem number space |
|
* |
|
* This function should *ONLY* be used from gpiolib-based GPIO drivers, |
|
* as part of their gpio_request() semantics, platforms and individual drivers |
|
* shall *NOT* request GPIO pins to be muxed in. |
|
*/ |
|
int pinctrl_gpio_request(unsigned gpio) |
|
{ |
|
struct pinctrl_dev *pctldev; |
|
struct pinctrl_gpio_range *range; |
|
int ret; |
|
int pin; |
|
|
|
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
|
if (ret) { |
|
if (pinctrl_ready_for_gpio_range(gpio)) |
|
ret = 0; |
|
return ret; |
|
} |
|
|
|
mutex_lock(&pctldev->mutex); |
|
|
|
/* Convert to the pin controllers number space */ |
|
pin = gpio_to_pin(range, gpio); |
|
|
|
ret = pinmux_request_gpio(pctldev, range, pin, gpio); |
|
|
|
mutex_unlock(&pctldev->mutex); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_gpio_request); |
|
|
|
/** |
|
* pinctrl_gpio_free() - free control on a single pin, currently used as GPIO |
|
* @gpio: the GPIO pin number from the GPIO subsystem number space |
|
* |
|
* This function should *ONLY* be used from gpiolib-based GPIO drivers, |
|
* as part of their gpio_free() semantics, platforms and individual drivers |
|
* shall *NOT* request GPIO pins to be muxed out. |
|
*/ |
|
void pinctrl_gpio_free(unsigned gpio) |
|
{ |
|
struct pinctrl_dev *pctldev; |
|
struct pinctrl_gpio_range *range; |
|
int ret; |
|
int pin; |
|
|
|
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
|
if (ret) { |
|
return; |
|
} |
|
mutex_lock(&pctldev->mutex); |
|
|
|
/* Convert to the pin controllers number space */ |
|
pin = gpio_to_pin(range, gpio); |
|
|
|
pinmux_free_gpio(pctldev, pin, range); |
|
|
|
mutex_unlock(&pctldev->mutex); |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_gpio_free); |
|
|
|
static int pinctrl_gpio_direction(unsigned gpio, bool input) |
|
{ |
|
struct pinctrl_dev *pctldev; |
|
struct pinctrl_gpio_range *range; |
|
int ret; |
|
int pin; |
|
|
|
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
|
if (ret) { |
|
return ret; |
|
} |
|
|
|
mutex_lock(&pctldev->mutex); |
|
|
|
/* Convert to the pin controllers number space */ |
|
pin = gpio_to_pin(range, gpio); |
|
ret = pinmux_gpio_direction(pctldev, range, pin, input); |
|
|
|
mutex_unlock(&pctldev->mutex); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* pinctrl_gpio_direction_input() - request a GPIO pin to go into input mode |
|
* @gpio: the GPIO pin number from the GPIO subsystem number space |
|
* |
|
* This function should *ONLY* be used from gpiolib-based GPIO drivers, |
|
* as part of their gpio_direction_input() semantics, platforms and individual |
|
* drivers shall *NOT* touch pin control GPIO calls. |
|
*/ |
|
int pinctrl_gpio_direction_input(unsigned gpio) |
|
{ |
|
return pinctrl_gpio_direction(gpio, true); |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_input); |
|
|
|
/** |
|
* pinctrl_gpio_direction_output() - request a GPIO pin to go into output mode |
|
* @gpio: the GPIO pin number from the GPIO subsystem number space |
|
* |
|
* This function should *ONLY* be used from gpiolib-based GPIO drivers, |
|
* as part of their gpio_direction_output() semantics, platforms and individual |
|
* drivers shall *NOT* touch pin control GPIO calls. |
|
*/ |
|
int pinctrl_gpio_direction_output(unsigned gpio) |
|
{ |
|
return pinctrl_gpio_direction(gpio, false); |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_gpio_direction_output); |
|
|
|
/** |
|
* pinctrl_gpio_set_config() - Apply config to given GPIO pin |
|
* @gpio: the GPIO pin number from the GPIO subsystem number space |
|
* @config: the configuration to apply to the GPIO |
|
* |
|
* This function should *ONLY* be used from gpiolib-based GPIO drivers, if |
|
* they need to call the underlying pin controller to change GPIO config |
|
* (for example set debounce time). |
|
*/ |
|
int pinctrl_gpio_set_config(unsigned gpio, unsigned long config) |
|
{ |
|
unsigned long configs[] = { config }; |
|
struct pinctrl_gpio_range *range; |
|
struct pinctrl_dev *pctldev; |
|
int ret, pin; |
|
|
|
ret = pinctrl_get_device_gpio_range(gpio, &pctldev, &range); |
|
if (ret) |
|
return ret; |
|
|
|
mutex_lock(&pctldev->mutex); |
|
pin = gpio_to_pin(range, gpio); |
|
ret = pinconf_set_config(pctldev, pin, configs, ARRAY_SIZE(configs)); |
|
mutex_unlock(&pctldev->mutex); |
|
|
|
return ret; |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_gpio_set_config); |
|
|
|
static struct pinctrl_state *find_state(struct pinctrl *p, |
|
const char *name) |
|
{ |
|
struct pinctrl_state *state; |
|
|
|
list_for_each_entry(state, &p->states, node) |
|
if (!strcmp(state->name, name)) |
|
return state; |
|
|
|
return NULL; |
|
} |
|
|
|
static struct pinctrl_state *create_state(struct pinctrl *p, |
|
const char *name) |
|
{ |
|
struct pinctrl_state *state; |
|
|
|
state = kzalloc(sizeof(*state), GFP_KERNEL); |
|
if (!state) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
state->name = name; |
|
INIT_LIST_HEAD(&state->settings); |
|
|
|
list_add_tail(&state->node, &p->states); |
|
|
|
return state; |
|
} |
|
|
|
static int add_setting(struct pinctrl *p, struct pinctrl_dev *pctldev, |
|
const struct pinctrl_map *map) |
|
{ |
|
struct pinctrl_state *state; |
|
struct pinctrl_setting *setting; |
|
int ret; |
|
|
|
state = find_state(p, map->name); |
|
if (!state) |
|
state = create_state(p, map->name); |
|
if (IS_ERR(state)) |
|
return PTR_ERR(state); |
|
|
|
if (map->type == PIN_MAP_TYPE_DUMMY_STATE) |
|
return 0; |
|
|
|
setting = kzalloc(sizeof(*setting), GFP_KERNEL); |
|
if (!setting) |
|
return -ENOMEM; |
|
|
|
setting->type = map->type; |
|
|
|
if (pctldev) |
|
setting->pctldev = pctldev; |
|
else |
|
setting->pctldev = |
|
get_pinctrl_dev_from_devname(map->ctrl_dev_name); |
|
if (!setting->pctldev) { |
|
kfree(setting); |
|
/* Do not defer probing of hogs (circular loop) */ |
|
if (!strcmp(map->ctrl_dev_name, map->dev_name)) |
|
return -ENODEV; |
|
/* |
|
* OK let us guess that the driver is not there yet, and |
|
* let's defer obtaining this pinctrl handle to later... |
|
*/ |
|
dev_info(p->dev, "unknown pinctrl device %s in map entry, deferring probe", |
|
map->ctrl_dev_name); |
|
return -EPROBE_DEFER; |
|
} |
|
|
|
setting->dev_name = map->dev_name; |
|
|
|
switch (map->type) { |
|
case PIN_MAP_TYPE_MUX_GROUP: |
|
ret = pinmux_map_to_setting(map, setting); |
|
break; |
|
case PIN_MAP_TYPE_CONFIGS_PIN: |
|
case PIN_MAP_TYPE_CONFIGS_GROUP: |
|
ret = pinconf_map_to_setting(map, setting); |
|
break; |
|
default: |
|
ret = -EINVAL; |
|
break; |
|
} |
|
if (ret < 0) { |
|
kfree(setting); |
|
return ret; |
|
} |
|
|
|
list_add_tail(&setting->node, &state->settings); |
|
|
|
return 0; |
|
} |
|
|
|
static struct pinctrl *find_pinctrl(struct device *dev) |
|
{ |
|
struct pinctrl *p; |
|
|
|
mutex_lock(&pinctrl_list_mutex); |
|
list_for_each_entry(p, &pinctrl_list, node) |
|
if (p->dev == dev) { |
|
mutex_unlock(&pinctrl_list_mutex); |
|
return p; |
|
} |
|
|
|
mutex_unlock(&pinctrl_list_mutex); |
|
return NULL; |
|
} |
|
|
|
static void pinctrl_free(struct pinctrl *p, bool inlist); |
|
|
|
static struct pinctrl *create_pinctrl(struct device *dev, |
|
struct pinctrl_dev *pctldev) |
|
{ |
|
struct pinctrl *p; |
|
const char *devname; |
|
struct pinctrl_maps *maps_node; |
|
int i; |
|
const struct pinctrl_map *map; |
|
int ret; |
|
|
|
/* |
|
* create the state cookie holder struct pinctrl for each |
|
* mapping, this is what consumers will get when requesting |
|
* a pin control handle with pinctrl_get() |
|
*/ |
|
p = kzalloc(sizeof(*p), GFP_KERNEL); |
|
if (!p) |
|
return ERR_PTR(-ENOMEM); |
|
p->dev = dev; |
|
INIT_LIST_HEAD(&p->states); |
|
INIT_LIST_HEAD(&p->dt_maps); |
|
|
|
ret = pinctrl_dt_to_map(p, pctldev); |
|
if (ret < 0) { |
|
kfree(p); |
|
return ERR_PTR(ret); |
|
} |
|
|
|
devname = dev_name(dev); |
|
|
|
mutex_lock(&pinctrl_maps_mutex); |
|
/* Iterate over the pin control maps to locate the right ones */ |
|
for_each_maps(maps_node, i, map) { |
|
/* Map must be for this device */ |
|
if (strcmp(map->dev_name, devname)) |
|
continue; |
|
/* |
|
* If pctldev is not null, we are claiming hog for it, |
|
* that means, setting that is served by pctldev by itself. |
|
* |
|
* Thus we must skip map that is for this device but is served |
|
* by other device. |
|
*/ |
|
if (pctldev && |
|
strcmp(dev_name(pctldev->dev), map->ctrl_dev_name)) |
|
continue; |
|
|
|
ret = add_setting(p, pctldev, map); |
|
/* |
|
* At this point the adding of a setting may: |
|
* |
|
* - Defer, if the pinctrl device is not yet available |
|
* - Fail, if the pinctrl device is not yet available, |
|
* AND the setting is a hog. We cannot defer that, since |
|
* the hog will kick in immediately after the device |
|
* is registered. |
|
* |
|
* If the error returned was not -EPROBE_DEFER then we |
|
* accumulate the errors to see if we end up with |
|
* an -EPROBE_DEFER later, as that is the worst case. |
|
*/ |
|
if (ret == -EPROBE_DEFER) { |
|
pinctrl_free(p, false); |
|
mutex_unlock(&pinctrl_maps_mutex); |
|
return ERR_PTR(ret); |
|
} |
|
} |
|
mutex_unlock(&pinctrl_maps_mutex); |
|
|
|
if (ret < 0) { |
|
/* If some other error than deferral occurred, return here */ |
|
pinctrl_free(p, false); |
|
return ERR_PTR(ret); |
|
} |
|
|
|
kref_init(&p->users); |
|
|
|
/* Add the pinctrl handle to the global list */ |
|
mutex_lock(&pinctrl_list_mutex); |
|
list_add_tail(&p->node, &pinctrl_list); |
|
mutex_unlock(&pinctrl_list_mutex); |
|
|
|
return p; |
|
} |
|
|
|
/** |
|
* pinctrl_get() - retrieves the pinctrl handle for a device |
|
* @dev: the device to obtain the handle for |
|
*/ |
|
struct pinctrl *pinctrl_get(struct device *dev) |
|
{ |
|
struct pinctrl *p; |
|
|
|
if (WARN_ON(!dev)) |
|
return ERR_PTR(-EINVAL); |
|
|
|
/* |
|
* See if somebody else (such as the device core) has already |
|
* obtained a handle to the pinctrl for this device. In that case, |
|
* return another pointer to it. |
|
*/ |
|
p = find_pinctrl(dev); |
|
if (p) { |
|
dev_dbg(dev, "obtain a copy of previously claimed pinctrl\n"); |
|
kref_get(&p->users); |
|
return p; |
|
} |
|
|
|
return create_pinctrl(dev, NULL); |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_get); |
|
|
|
static void pinctrl_free_setting(bool disable_setting, |
|
struct pinctrl_setting *setting) |
|
{ |
|
switch (setting->type) { |
|
case PIN_MAP_TYPE_MUX_GROUP: |
|
if (disable_setting) |
|
pinmux_disable_setting(setting); |
|
pinmux_free_setting(setting); |
|
break; |
|
case PIN_MAP_TYPE_CONFIGS_PIN: |
|
case PIN_MAP_TYPE_CONFIGS_GROUP: |
|
pinconf_free_setting(setting); |
|
break; |
|
default: |
|
break; |
|
} |
|
} |
|
|
|
static void pinctrl_free(struct pinctrl *p, bool inlist) |
|
{ |
|
struct pinctrl_state *state, *n1; |
|
struct pinctrl_setting *setting, *n2; |
|
|
|
mutex_lock(&pinctrl_list_mutex); |
|
list_for_each_entry_safe(state, n1, &p->states, node) { |
|
list_for_each_entry_safe(setting, n2, &state->settings, node) { |
|
pinctrl_free_setting(state == p->state, setting); |
|
list_del(&setting->node); |
|
kfree(setting); |
|
} |
|
list_del(&state->node); |
|
kfree(state); |
|
} |
|
|
|
pinctrl_dt_free_maps(p); |
|
|
|
if (inlist) |
|
list_del(&p->node); |
|
kfree(p); |
|
mutex_unlock(&pinctrl_list_mutex); |
|
} |
|
|
|
/** |
|
* pinctrl_release() - release the pinctrl handle |
|
* @kref: the kref in the pinctrl being released |
|
*/ |
|
static void pinctrl_release(struct kref *kref) |
|
{ |
|
struct pinctrl *p = container_of(kref, struct pinctrl, users); |
|
|
|
pinctrl_free(p, true); |
|
} |
|
|
|
/** |
|
* pinctrl_put() - decrease use count on a previously claimed pinctrl handle |
|
* @p: the pinctrl handle to release |
|
*/ |
|
void pinctrl_put(struct pinctrl *p) |
|
{ |
|
kref_put(&p->users, pinctrl_release); |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_put); |
|
|
|
/** |
|
* pinctrl_lookup_state() - retrieves a state handle from a pinctrl handle |
|
* @p: the pinctrl handle to retrieve the state from |
|
* @name: the state name to retrieve |
|
*/ |
|
struct pinctrl_state *pinctrl_lookup_state(struct pinctrl *p, |
|
const char *name) |
|
{ |
|
struct pinctrl_state *state; |
|
|
|
state = find_state(p, name); |
|
if (!state) { |
|
if (pinctrl_dummy_state) { |
|
/* create dummy state */ |
|
dev_dbg(p->dev, "using pinctrl dummy state (%s)\n", |
|
name); |
|
state = create_state(p, name); |
|
} else |
|
state = ERR_PTR(-ENODEV); |
|
} |
|
|
|
return state; |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_lookup_state); |
|
|
|
static void pinctrl_link_add(struct pinctrl_dev *pctldev, |
|
struct device *consumer) |
|
{ |
|
if (pctldev->desc->link_consumers) |
|
device_link_add(consumer, pctldev->dev, |
|
DL_FLAG_PM_RUNTIME | |
|
DL_FLAG_AUTOREMOVE_CONSUMER); |
|
} |
|
|
|
/** |
|
* pinctrl_commit_state() - select/activate/program a pinctrl state to HW |
|
* @p: the pinctrl handle for the device that requests configuration |
|
* @state: the state handle to select/activate/program |
|
*/ |
|
static int pinctrl_commit_state(struct pinctrl *p, struct pinctrl_state *state) |
|
{ |
|
struct pinctrl_setting *setting, *setting2; |
|
struct pinctrl_state *old_state = p->state; |
|
int ret; |
|
|
|
if (p->state) { |
|
/* |
|
* For each pinmux setting in the old state, forget SW's record |
|
* of mux owner for that pingroup. Any pingroups which are |
|
* still owned by the new state will be re-acquired by the call |
|
* to pinmux_enable_setting() in the loop below. |
|
*/ |
|
list_for_each_entry(setting, &p->state->settings, node) { |
|
if (setting->type != PIN_MAP_TYPE_MUX_GROUP) |
|
continue; |
|
pinmux_disable_setting(setting); |
|
} |
|
} |
|
|
|
p->state = NULL; |
|
|
|
/* Apply all the settings for the new state */ |
|
list_for_each_entry(setting, &state->settings, node) { |
|
switch (setting->type) { |
|
case PIN_MAP_TYPE_MUX_GROUP: |
|
ret = pinmux_enable_setting(setting); |
|
break; |
|
case PIN_MAP_TYPE_CONFIGS_PIN: |
|
case PIN_MAP_TYPE_CONFIGS_GROUP: |
|
ret = pinconf_apply_setting(setting); |
|
break; |
|
default: |
|
ret = -EINVAL; |
|
break; |
|
} |
|
|
|
if (ret < 0) { |
|
goto unapply_new_state; |
|
} |
|
|
|
/* Do not link hogs (circular dependency) */ |
|
if (p != setting->pctldev->p) |
|
pinctrl_link_add(setting->pctldev, p->dev); |
|
} |
|
|
|
p->state = state; |
|
|
|
return 0; |
|
|
|
unapply_new_state: |
|
dev_err(p->dev, "Error applying setting, reverse things back\n"); |
|
|
|
list_for_each_entry(setting2, &state->settings, node) { |
|
if (&setting2->node == &setting->node) |
|
break; |
|
/* |
|
* All we can do here is pinmux_disable_setting. |
|
* That means that some pins are muxed differently now |
|
* than they were before applying the setting (We can't |
|
* "unmux a pin"!), but it's not a big deal since the pins |
|
* are free to be muxed by another apply_setting. |
|
*/ |
|
if (setting2->type == PIN_MAP_TYPE_MUX_GROUP) |
|
pinmux_disable_setting(setting2); |
|
} |
|
|
|
/* There's no infinite recursive loop here because p->state is NULL */ |
|
if (old_state) |
|
pinctrl_select_state(p, old_state); |
|
|
|
return ret; |
|
} |
|
|
|
/** |
|
* pinctrl_select_state() - select/activate/program a pinctrl state to HW |
|
* @p: the pinctrl handle for the device that requests configuration |
|
* @state: the state handle to select/activate/program |
|
*/ |
|
int pinctrl_select_state(struct pinctrl *p, struct pinctrl_state *state) |
|
{ |
|
if (p->state == state) |
|
return 0; |
|
|
|
return pinctrl_commit_state(p, state); |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_select_state); |
|
|
|
static void devm_pinctrl_release(struct device *dev, void *res) |
|
{ |
|
pinctrl_put(*(struct pinctrl **)res); |
|
} |
|
|
|
/** |
|
* devm_pinctrl_get() - Resource managed pinctrl_get() |
|
* @dev: the device to obtain the handle for |
|
* |
|
* If there is a need to explicitly destroy the returned struct pinctrl, |
|
* devm_pinctrl_put() should be used, rather than plain pinctrl_put(). |
|
*/ |
|
struct pinctrl *devm_pinctrl_get(struct device *dev) |
|
{ |
|
struct pinctrl **ptr, *p; |
|
|
|
ptr = devres_alloc(devm_pinctrl_release, sizeof(*ptr), GFP_KERNEL); |
|
if (!ptr) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
p = pinctrl_get(dev); |
|
if (!IS_ERR(p)) { |
|
*ptr = p; |
|
devres_add(dev, ptr); |
|
} else { |
|
devres_free(ptr); |
|
} |
|
|
|
return p; |
|
} |
|
EXPORT_SYMBOL_GPL(devm_pinctrl_get); |
|
|
|
static int devm_pinctrl_match(struct device *dev, void *res, void *data) |
|
{ |
|
struct pinctrl **p = res; |
|
|
|
return *p == data; |
|
} |
|
|
|
/** |
|
* devm_pinctrl_put() - Resource managed pinctrl_put() |
|
* @p: the pinctrl handle to release |
|
* |
|
* Deallocate a struct pinctrl obtained via devm_pinctrl_get(). Normally |
|
* this function will not need to be called and the resource management |
|
* code will ensure that the resource is freed. |
|
*/ |
|
void devm_pinctrl_put(struct pinctrl *p) |
|
{ |
|
WARN_ON(devres_release(p->dev, devm_pinctrl_release, |
|
devm_pinctrl_match, p)); |
|
} |
|
EXPORT_SYMBOL_GPL(devm_pinctrl_put); |
|
|
|
/** |
|
* pinctrl_register_mappings() - register a set of pin controller mappings |
|
* @maps: the pincontrol mappings table to register. Note the pinctrl-core |
|
* keeps a reference to the passed in maps, so they should _not_ be |
|
* marked with __initdata. |
|
* @num_maps: the number of maps in the mapping table |
|
*/ |
|
int pinctrl_register_mappings(const struct pinctrl_map *maps, |
|
unsigned num_maps) |
|
{ |
|
int i, ret; |
|
struct pinctrl_maps *maps_node; |
|
|
|
pr_debug("add %u pinctrl maps\n", num_maps); |
|
|
|
/* First sanity check the new mapping */ |
|
for (i = 0; i < num_maps; i++) { |
|
if (!maps[i].dev_name) { |
|
pr_err("failed to register map %s (%d): no device given\n", |
|
maps[i].name, i); |
|
return -EINVAL; |
|
} |
|
|
|
if (!maps[i].name) { |
|
pr_err("failed to register map %d: no map name given\n", |
|
i); |
|
return -EINVAL; |
|
} |
|
|
|
if (maps[i].type != PIN_MAP_TYPE_DUMMY_STATE && |
|
!maps[i].ctrl_dev_name) { |
|
pr_err("failed to register map %s (%d): no pin control device given\n", |
|
maps[i].name, i); |
|
return -EINVAL; |
|
} |
|
|
|
switch (maps[i].type) { |
|
case PIN_MAP_TYPE_DUMMY_STATE: |
|
break; |
|
case PIN_MAP_TYPE_MUX_GROUP: |
|
ret = pinmux_validate_map(&maps[i], i); |
|
if (ret < 0) |
|
return ret; |
|
break; |
|
case PIN_MAP_TYPE_CONFIGS_PIN: |
|
case PIN_MAP_TYPE_CONFIGS_GROUP: |
|
ret = pinconf_validate_map(&maps[i], i); |
|
if (ret < 0) |
|
return ret; |
|
break; |
|
default: |
|
pr_err("failed to register map %s (%d): invalid type given\n", |
|
maps[i].name, i); |
|
return -EINVAL; |
|
} |
|
} |
|
|
|
maps_node = kzalloc(sizeof(*maps_node), GFP_KERNEL); |
|
if (!maps_node) |
|
return -ENOMEM; |
|
|
|
maps_node->maps = maps; |
|
maps_node->num_maps = num_maps; |
|
|
|
mutex_lock(&pinctrl_maps_mutex); |
|
list_add_tail(&maps_node->node, &pinctrl_maps); |
|
mutex_unlock(&pinctrl_maps_mutex); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_register_mappings); |
|
|
|
/** |
|
* pinctrl_unregister_mappings() - unregister a set of pin controller mappings |
|
* @map: the pincontrol mappings table passed to pinctrl_register_mappings() |
|
* when registering the mappings. |
|
*/ |
|
void pinctrl_unregister_mappings(const struct pinctrl_map *map) |
|
{ |
|
struct pinctrl_maps *maps_node; |
|
|
|
mutex_lock(&pinctrl_maps_mutex); |
|
list_for_each_entry(maps_node, &pinctrl_maps, node) { |
|
if (maps_node->maps == map) { |
|
list_del(&maps_node->node); |
|
kfree(maps_node); |
|
mutex_unlock(&pinctrl_maps_mutex); |
|
return; |
|
} |
|
} |
|
mutex_unlock(&pinctrl_maps_mutex); |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_unregister_mappings); |
|
|
|
/** |
|
* pinctrl_force_sleep() - turn a given controller device into sleep state |
|
* @pctldev: pin controller device |
|
*/ |
|
int pinctrl_force_sleep(struct pinctrl_dev *pctldev) |
|
{ |
|
if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_sleep)) |
|
return pinctrl_commit_state(pctldev->p, pctldev->hog_sleep); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_force_sleep); |
|
|
|
/** |
|
* pinctrl_force_default() - turn a given controller device into default state |
|
* @pctldev: pin controller device |
|
*/ |
|
int pinctrl_force_default(struct pinctrl_dev *pctldev) |
|
{ |
|
if (!IS_ERR(pctldev->p) && !IS_ERR(pctldev->hog_default)) |
|
return pinctrl_commit_state(pctldev->p, pctldev->hog_default); |
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_force_default); |
|
|
|
/** |
|
* pinctrl_init_done() - tell pinctrl probe is done |
|
* |
|
* We'll use this time to switch the pins from "init" to "default" unless the |
|
* driver selected some other state. |
|
* |
|
* @dev: device to that's done probing |
|
*/ |
|
int pinctrl_init_done(struct device *dev) |
|
{ |
|
struct dev_pin_info *pins = dev->pins; |
|
int ret; |
|
|
|
if (!pins) |
|
return 0; |
|
|
|
if (IS_ERR(pins->init_state)) |
|
return 0; /* No such state */ |
|
|
|
if (pins->p->state != pins->init_state) |
|
return 0; /* Not at init anyway */ |
|
|
|
if (IS_ERR(pins->default_state)) |
|
return 0; /* No default state */ |
|
|
|
ret = pinctrl_select_state(pins->p, pins->default_state); |
|
if (ret) |
|
dev_err(dev, "failed to activate default pinctrl state\n"); |
|
|
|
return ret; |
|
} |
|
|
|
static int pinctrl_select_bound_state(struct device *dev, |
|
struct pinctrl_state *state) |
|
{ |
|
struct dev_pin_info *pins = dev->pins; |
|
int ret; |
|
|
|
if (IS_ERR(state)) |
|
return 0; /* No such state */ |
|
ret = pinctrl_select_state(pins->p, state); |
|
if (ret) |
|
dev_err(dev, "failed to activate pinctrl state %s\n", |
|
state->name); |
|
return ret; |
|
} |
|
|
|
/** |
|
* pinctrl_select_default_state() - select default pinctrl state |
|
* @dev: device to select default state for |
|
*/ |
|
int pinctrl_select_default_state(struct device *dev) |
|
{ |
|
if (!dev->pins) |
|
return 0; |
|
|
|
return pinctrl_select_bound_state(dev, dev->pins->default_state); |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_select_default_state); |
|
|
|
#ifdef CONFIG_PM |
|
|
|
/** |
|
* pinctrl_pm_select_default_state() - select default pinctrl state for PM |
|
* @dev: device to select default state for |
|
*/ |
|
int pinctrl_pm_select_default_state(struct device *dev) |
|
{ |
|
return pinctrl_select_default_state(dev); |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_pm_select_default_state); |
|
|
|
/** |
|
* pinctrl_pm_select_sleep_state() - select sleep pinctrl state for PM |
|
* @dev: device to select sleep state for |
|
*/ |
|
int pinctrl_pm_select_sleep_state(struct device *dev) |
|
{ |
|
if (!dev->pins) |
|
return 0; |
|
|
|
return pinctrl_select_bound_state(dev, dev->pins->sleep_state); |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_pm_select_sleep_state); |
|
|
|
/** |
|
* pinctrl_pm_select_idle_state() - select idle pinctrl state for PM |
|
* @dev: device to select idle state for |
|
*/ |
|
int pinctrl_pm_select_idle_state(struct device *dev) |
|
{ |
|
if (!dev->pins) |
|
return 0; |
|
|
|
return pinctrl_select_bound_state(dev, dev->pins->idle_state); |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_pm_select_idle_state); |
|
#endif |
|
|
|
#ifdef CONFIG_DEBUG_FS |
|
|
|
static int pinctrl_pins_show(struct seq_file *s, void *what) |
|
{ |
|
struct pinctrl_dev *pctldev = s->private; |
|
const struct pinctrl_ops *ops = pctldev->desc->pctlops; |
|
unsigned i, pin; |
|
#ifdef CONFIG_GPIOLIB |
|
struct pinctrl_gpio_range *range; |
|
struct gpio_chip *chip; |
|
int gpio_num; |
|
#endif |
|
|
|
seq_printf(s, "registered pins: %d\n", pctldev->desc->npins); |
|
|
|
mutex_lock(&pctldev->mutex); |
|
|
|
/* The pin number can be retrived from the pin controller descriptor */ |
|
for (i = 0; i < pctldev->desc->npins; i++) { |
|
struct pin_desc *desc; |
|
|
|
pin = pctldev->desc->pins[i].number; |
|
desc = pin_desc_get(pctldev, pin); |
|
/* Pin space may be sparse */ |
|
if (!desc) |
|
continue; |
|
|
|
seq_printf(s, "pin %d (%s) ", pin, desc->name); |
|
|
|
#ifdef CONFIG_GPIOLIB |
|
gpio_num = -1; |
|
list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
|
if ((pin >= range->pin_base) && |
|
(pin < (range->pin_base + range->npins))) { |
|
gpio_num = range->base + (pin - range->pin_base); |
|
break; |
|
} |
|
} |
|
if (gpio_num >= 0) |
|
chip = gpio_to_chip(gpio_num); |
|
else |
|
chip = NULL; |
|
if (chip) |
|
seq_printf(s, "%u:%s ", gpio_num - chip->gpiodev->base, chip->label); |
|
else |
|
seq_puts(s, "0:? "); |
|
#endif |
|
|
|
/* Driver-specific info per pin */ |
|
if (ops->pin_dbg_show) |
|
ops->pin_dbg_show(pctldev, s, pin); |
|
|
|
seq_puts(s, "\n"); |
|
} |
|
|
|
mutex_unlock(&pctldev->mutex); |
|
|
|
return 0; |
|
} |
|
DEFINE_SHOW_ATTRIBUTE(pinctrl_pins); |
|
|
|
static int pinctrl_groups_show(struct seq_file *s, void *what) |
|
{ |
|
struct pinctrl_dev *pctldev = s->private; |
|
const struct pinctrl_ops *ops = pctldev->desc->pctlops; |
|
unsigned 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; |
|
} |
|
DEFINE_SHOW_ATTRIBUTE(pinctrl_groups); |
|
|
|
static int pinctrl_gpioranges_show(struct seq_file *s, void *what) |
|
{ |
|
struct pinctrl_dev *pctldev = s->private; |
|
struct pinctrl_gpio_range *range; |
|
|
|
seq_puts(s, "GPIO ranges handled:\n"); |
|
|
|
mutex_lock(&pctldev->mutex); |
|
|
|
/* Loop over the ranges */ |
|
list_for_each_entry(range, &pctldev->gpio_ranges, node) { |
|
if (range->pins) { |
|
int a; |
|
seq_printf(s, "%u: %s GPIOS [%u - %u] PINS {", |
|
range->id, range->name, |
|
range->base, (range->base + range->npins - 1)); |
|
for (a = 0; a < range->npins - 1; a++) |
|
seq_printf(s, "%u, ", range->pins[a]); |
|
seq_printf(s, "%u}\n", range->pins[a]); |
|
} |
|
else |
|
seq_printf(s, "%u: %s GPIOS [%u - %u] PINS [%u - %u]\n", |
|
range->id, range->name, |
|
range->base, (range->base + range->npins - 1), |
|
range->pin_base, |
|
(range->pin_base + range->npins - 1)); |
|
} |
|
|
|
mutex_unlock(&pctldev->mutex); |
|
|
|
return 0; |
|
} |
|
DEFINE_SHOW_ATTRIBUTE(pinctrl_gpioranges); |
|
|
|
static int pinctrl_devices_show(struct seq_file *s, void *what) |
|
{ |
|
struct pinctrl_dev *pctldev; |
|
|
|
seq_puts(s, "name [pinmux] [pinconf]\n"); |
|
|
|
mutex_lock(&pinctrldev_list_mutex); |
|
|
|
list_for_each_entry(pctldev, &pinctrldev_list, node) { |
|
seq_printf(s, "%s ", pctldev->desc->name); |
|
if (pctldev->desc->pmxops) |
|
seq_puts(s, "yes "); |
|
else |
|
seq_puts(s, "no "); |
|
if (pctldev->desc->confops) |
|
seq_puts(s, "yes"); |
|
else |
|
seq_puts(s, "no"); |
|
seq_puts(s, "\n"); |
|
} |
|
|
|
mutex_unlock(&pinctrldev_list_mutex); |
|
|
|
return 0; |
|
} |
|
DEFINE_SHOW_ATTRIBUTE(pinctrl_devices); |
|
|
|
static inline const char *map_type(enum pinctrl_map_type type) |
|
{ |
|
static const char * const names[] = { |
|
"INVALID", |
|
"DUMMY_STATE", |
|
"MUX_GROUP", |
|
"CONFIGS_PIN", |
|
"CONFIGS_GROUP", |
|
}; |
|
|
|
if (type >= ARRAY_SIZE(names)) |
|
return "UNKNOWN"; |
|
|
|
return names[type]; |
|
} |
|
|
|
static int pinctrl_maps_show(struct seq_file *s, void *what) |
|
{ |
|
struct pinctrl_maps *maps_node; |
|
int i; |
|
const struct pinctrl_map *map; |
|
|
|
seq_puts(s, "Pinctrl maps:\n"); |
|
|
|
mutex_lock(&pinctrl_maps_mutex); |
|
for_each_maps(maps_node, i, map) { |
|
seq_printf(s, "device %s\nstate %s\ntype %s (%d)\n", |
|
map->dev_name, map->name, map_type(map->type), |
|
map->type); |
|
|
|
if (map->type != PIN_MAP_TYPE_DUMMY_STATE) |
|
seq_printf(s, "controlling device %s\n", |
|
map->ctrl_dev_name); |
|
|
|
switch (map->type) { |
|
case PIN_MAP_TYPE_MUX_GROUP: |
|
pinmux_show_map(s, map); |
|
break; |
|
case PIN_MAP_TYPE_CONFIGS_PIN: |
|
case PIN_MAP_TYPE_CONFIGS_GROUP: |
|
pinconf_show_map(s, map); |
|
break; |
|
default: |
|
break; |
|
} |
|
|
|
seq_putc(s, '\n'); |
|
} |
|
mutex_unlock(&pinctrl_maps_mutex); |
|
|
|
return 0; |
|
} |
|
DEFINE_SHOW_ATTRIBUTE(pinctrl_maps); |
|
|
|
static int pinctrl_show(struct seq_file *s, void *what) |
|
{ |
|
struct pinctrl *p; |
|
struct pinctrl_state *state; |
|
struct pinctrl_setting *setting; |
|
|
|
seq_puts(s, "Requested pin control handlers their pinmux maps:\n"); |
|
|
|
mutex_lock(&pinctrl_list_mutex); |
|
|
|
list_for_each_entry(p, &pinctrl_list, node) { |
|
seq_printf(s, "device: %s current state: %s\n", |
|
dev_name(p->dev), |
|
p->state ? p->state->name : "none"); |
|
|
|
list_for_each_entry(state, &p->states, node) { |
|
seq_printf(s, " state: %s\n", state->name); |
|
|
|
list_for_each_entry(setting, &state->settings, node) { |
|
struct pinctrl_dev *pctldev = setting->pctldev; |
|
|
|
seq_printf(s, " type: %s controller %s ", |
|
map_type(setting->type), |
|
pinctrl_dev_get_name(pctldev)); |
|
|
|
switch (setting->type) { |
|
case PIN_MAP_TYPE_MUX_GROUP: |
|
pinmux_show_setting(s, setting); |
|
break; |
|
case PIN_MAP_TYPE_CONFIGS_PIN: |
|
case PIN_MAP_TYPE_CONFIGS_GROUP: |
|
pinconf_show_setting(s, setting); |
|
break; |
|
default: |
|
break; |
|
} |
|
} |
|
} |
|
} |
|
|
|
mutex_unlock(&pinctrl_list_mutex); |
|
|
|
return 0; |
|
} |
|
DEFINE_SHOW_ATTRIBUTE(pinctrl); |
|
|
|
static struct dentry *debugfs_root; |
|
|
|
static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) |
|
{ |
|
struct dentry *device_root; |
|
const char *debugfs_name; |
|
|
|
if (pctldev->desc->name && |
|
strcmp(dev_name(pctldev->dev), pctldev->desc->name)) { |
|
debugfs_name = devm_kasprintf(pctldev->dev, GFP_KERNEL, |
|
"%s-%s", dev_name(pctldev->dev), |
|
pctldev->desc->name); |
|
if (!debugfs_name) { |
|
pr_warn("failed to determine debugfs dir name for %s\n", |
|
dev_name(pctldev->dev)); |
|
return; |
|
} |
|
} else { |
|
debugfs_name = dev_name(pctldev->dev); |
|
} |
|
|
|
device_root = debugfs_create_dir(debugfs_name, debugfs_root); |
|
pctldev->device_root = device_root; |
|
|
|
if (IS_ERR(device_root) || !device_root) { |
|
pr_warn("failed to create debugfs directory for %s\n", |
|
dev_name(pctldev->dev)); |
|
return; |
|
} |
|
debugfs_create_file("pins", S_IFREG | S_IRUGO, |
|
device_root, pctldev, &pinctrl_pins_fops); |
|
debugfs_create_file("pingroups", S_IFREG | S_IRUGO, |
|
device_root, pctldev, &pinctrl_groups_fops); |
|
debugfs_create_file("gpio-ranges", S_IFREG | S_IRUGO, |
|
device_root, pctldev, &pinctrl_gpioranges_fops); |
|
if (pctldev->desc->pmxops) |
|
pinmux_init_device_debugfs(device_root, pctldev); |
|
if (pctldev->desc->confops) |
|
pinconf_init_device_debugfs(device_root, pctldev); |
|
} |
|
|
|
static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
|
{ |
|
debugfs_remove_recursive(pctldev->device_root); |
|
} |
|
|
|
static void pinctrl_init_debugfs(void) |
|
{ |
|
debugfs_root = debugfs_create_dir("pinctrl", NULL); |
|
if (IS_ERR(debugfs_root) || !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_fops); |
|
debugfs_create_file("pinctrl-maps", S_IFREG | S_IRUGO, |
|
debugfs_root, NULL, &pinctrl_maps_fops); |
|
debugfs_create_file("pinctrl-handles", S_IFREG | S_IRUGO, |
|
debugfs_root, NULL, &pinctrl_fops); |
|
} |
|
|
|
#else /* CONFIG_DEBUG_FS */ |
|
|
|
static void pinctrl_init_device_debugfs(struct pinctrl_dev *pctldev) |
|
{ |
|
} |
|
|
|
static void pinctrl_init_debugfs(void) |
|
{ |
|
} |
|
|
|
static void pinctrl_remove_device_debugfs(struct pinctrl_dev *pctldev) |
|
{ |
|
} |
|
|
|
#endif |
|
|
|
static int pinctrl_check_ops(struct pinctrl_dev *pctldev) |
|
{ |
|
const struct pinctrl_ops *ops = pctldev->desc->pctlops; |
|
|
|
if (!ops || |
|
!ops->get_groups_count || |
|
!ops->get_group_name) |
|
return -EINVAL; |
|
|
|
return 0; |
|
} |
|
|
|
/** |
|
* pinctrl_init_controller() - init a pin controller device |
|
* @pctldesc: descriptor for this pin controller |
|
* @dev: parent device for this pin controller |
|
* @driver_data: private pin controller data for this pin controller |
|
*/ |
|
static struct pinctrl_dev * |
|
pinctrl_init_controller(struct pinctrl_desc *pctldesc, struct device *dev, |
|
void *driver_data) |
|
{ |
|
struct pinctrl_dev *pctldev; |
|
int ret; |
|
|
|
if (!pctldesc) |
|
return ERR_PTR(-EINVAL); |
|
if (!pctldesc->name) |
|
return ERR_PTR(-EINVAL); |
|
|
|
pctldev = kzalloc(sizeof(*pctldev), GFP_KERNEL); |
|
if (!pctldev) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
/* Initialize pin control device struct */ |
|
pctldev->owner = pctldesc->owner; |
|
pctldev->desc = pctldesc; |
|
pctldev->driver_data = driver_data; |
|
INIT_RADIX_TREE(&pctldev->pin_desc_tree, GFP_KERNEL); |
|
#ifdef CONFIG_GENERIC_PINCTRL_GROUPS |
|
INIT_RADIX_TREE(&pctldev->pin_group_tree, GFP_KERNEL); |
|
#endif |
|
#ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS |
|
INIT_RADIX_TREE(&pctldev->pin_function_tree, GFP_KERNEL); |
|
#endif |
|
INIT_LIST_HEAD(&pctldev->gpio_ranges); |
|
INIT_LIST_HEAD(&pctldev->node); |
|
pctldev->dev = dev; |
|
mutex_init(&pctldev->mutex); |
|
|
|
/* check core ops for sanity */ |
|
ret = pinctrl_check_ops(pctldev); |
|
if (ret) { |
|
dev_err(dev, "pinctrl ops lacks necessary functions\n"); |
|
goto out_err; |
|
} |
|
|
|
/* If we're implementing pinmuxing, check the ops for sanity */ |
|
if (pctldesc->pmxops) { |
|
ret = pinmux_check_ops(pctldev); |
|
if (ret) |
|
goto out_err; |
|
} |
|
|
|
/* If we're implementing pinconfig, check the ops for sanity */ |
|
if (pctldesc->confops) { |
|
ret = pinconf_check_ops(pctldev); |
|
if (ret) |
|
goto out_err; |
|
} |
|
|
|
/* Register all the pins */ |
|
dev_dbg(dev, "try to register %d pins ...\n", pctldesc->npins); |
|
ret = pinctrl_register_pins(pctldev, pctldesc->pins, pctldesc->npins); |
|
if (ret) { |
|
dev_err(dev, "error during pin registration\n"); |
|
pinctrl_free_pindescs(pctldev, pctldesc->pins, |
|
pctldesc->npins); |
|
goto out_err; |
|
} |
|
|
|
return pctldev; |
|
|
|
out_err: |
|
mutex_destroy(&pctldev->mutex); |
|
kfree(pctldev); |
|
return ERR_PTR(ret); |
|
} |
|
|
|
static int pinctrl_claim_hogs(struct pinctrl_dev *pctldev) |
|
{ |
|
pctldev->p = create_pinctrl(pctldev->dev, pctldev); |
|
if (PTR_ERR(pctldev->p) == -ENODEV) { |
|
dev_dbg(pctldev->dev, "no hogs found\n"); |
|
|
|
return 0; |
|
} |
|
|
|
if (IS_ERR(pctldev->p)) { |
|
dev_err(pctldev->dev, "error claiming hogs: %li\n", |
|
PTR_ERR(pctldev->p)); |
|
|
|
return PTR_ERR(pctldev->p); |
|
} |
|
|
|
pctldev->hog_default = |
|
pinctrl_lookup_state(pctldev->p, PINCTRL_STATE_DEFAULT); |
|
if (IS_ERR(pctldev->hog_default)) { |
|
dev_dbg(pctldev->dev, |
|
"failed to lookup the default state\n"); |
|
} else { |
|
if (pinctrl_select_state(pctldev->p, |
|
pctldev->hog_default)) |
|
dev_err(pctldev->dev, |
|
"failed to select default state\n"); |
|
} |
|
|
|
pctldev->hog_sleep = |
|
pinctrl_lookup_state(pctldev->p, |
|
PINCTRL_STATE_SLEEP); |
|
if (IS_ERR(pctldev->hog_sleep)) |
|
dev_dbg(pctldev->dev, |
|
"failed to lookup the sleep state\n"); |
|
|
|
return 0; |
|
} |
|
|
|
int pinctrl_enable(struct pinctrl_dev *pctldev) |
|
{ |
|
int error; |
|
|
|
error = pinctrl_claim_hogs(pctldev); |
|
if (error) { |
|
dev_err(pctldev->dev, "could not claim hogs: %i\n", |
|
error); |
|
mutex_destroy(&pctldev->mutex); |
|
kfree(pctldev); |
|
|
|
return error; |
|
} |
|
|
|
mutex_lock(&pinctrldev_list_mutex); |
|
list_add_tail(&pctldev->node, &pinctrldev_list); |
|
mutex_unlock(&pinctrldev_list_mutex); |
|
|
|
pinctrl_init_device_debugfs(pctldev); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_enable); |
|
|
|
/** |
|
* pinctrl_register() - register a pin controller device |
|
* @pctldesc: descriptor for this pin controller |
|
* @dev: parent device for this pin controller |
|
* @driver_data: private pin controller data for this pin controller |
|
* |
|
* Note that pinctrl_register() is known to have problems as the pin |
|
* controller driver functions are called before the driver has a |
|
* struct pinctrl_dev handle. To avoid issues later on, please use the |
|
* new pinctrl_register_and_init() below instead. |
|
*/ |
|
struct pinctrl_dev *pinctrl_register(struct pinctrl_desc *pctldesc, |
|
struct device *dev, void *driver_data) |
|
{ |
|
struct pinctrl_dev *pctldev; |
|
int error; |
|
|
|
pctldev = pinctrl_init_controller(pctldesc, dev, driver_data); |
|
if (IS_ERR(pctldev)) |
|
return pctldev; |
|
|
|
error = pinctrl_enable(pctldev); |
|
if (error) |
|
return ERR_PTR(error); |
|
|
|
return pctldev; |
|
|
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_register); |
|
|
|
/** |
|
* pinctrl_register_and_init() - register and init pin controller device |
|
* @pctldesc: descriptor for this pin controller |
|
* @dev: parent device for this pin controller |
|
* @driver_data: private pin controller data for this pin controller |
|
* @pctldev: pin controller device |
|
* |
|
* Note that pinctrl_enable() still needs to be manually called after |
|
* this once the driver is ready. |
|
*/ |
|
int pinctrl_register_and_init(struct pinctrl_desc *pctldesc, |
|
struct device *dev, void *driver_data, |
|
struct pinctrl_dev **pctldev) |
|
{ |
|
struct pinctrl_dev *p; |
|
|
|
p = pinctrl_init_controller(pctldesc, dev, driver_data); |
|
if (IS_ERR(p)) |
|
return PTR_ERR(p); |
|
|
|
/* |
|
* We have pinctrl_start() call functions in the pin controller |
|
* driver with create_pinctrl() for at least dt_node_to_map(). So |
|
* let's make sure pctldev is properly initialized for the |
|
* pin controller driver before we do anything. |
|
*/ |
|
*pctldev = p; |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_register_and_init); |
|
|
|
/** |
|
* pinctrl_unregister() - unregister pinmux |
|
* @pctldev: pin controller to unregister |
|
* |
|
* Called by pinmux drivers to unregister a pinmux. |
|
*/ |
|
void pinctrl_unregister(struct pinctrl_dev *pctldev) |
|
{ |
|
struct pinctrl_gpio_range *range, *n; |
|
|
|
if (!pctldev) |
|
return; |
|
|
|
mutex_lock(&pctldev->mutex); |
|
pinctrl_remove_device_debugfs(pctldev); |
|
mutex_unlock(&pctldev->mutex); |
|
|
|
if (!IS_ERR_OR_NULL(pctldev->p)) |
|
pinctrl_put(pctldev->p); |
|
|
|
mutex_lock(&pinctrldev_list_mutex); |
|
mutex_lock(&pctldev->mutex); |
|
/* TODO: check that no pinmuxes are still active? */ |
|
list_del(&pctldev->node); |
|
pinmux_generic_free_functions(pctldev); |
|
pinctrl_generic_free_groups(pctldev); |
|
/* Destroy descriptor tree */ |
|
pinctrl_free_pindescs(pctldev, pctldev->desc->pins, |
|
pctldev->desc->npins); |
|
/* remove gpio ranges map */ |
|
list_for_each_entry_safe(range, n, &pctldev->gpio_ranges, node) |
|
list_del(&range->node); |
|
|
|
mutex_unlock(&pctldev->mutex); |
|
mutex_destroy(&pctldev->mutex); |
|
kfree(pctldev); |
|
mutex_unlock(&pinctrldev_list_mutex); |
|
} |
|
EXPORT_SYMBOL_GPL(pinctrl_unregister); |
|
|
|
static void devm_pinctrl_dev_release(struct device *dev, void *res) |
|
{ |
|
struct pinctrl_dev *pctldev = *(struct pinctrl_dev **)res; |
|
|
|
pinctrl_unregister(pctldev); |
|
} |
|
|
|
static int devm_pinctrl_dev_match(struct device *dev, void *res, void *data) |
|
{ |
|
struct pctldev **r = res; |
|
|
|
if (WARN_ON(!r || !*r)) |
|
return 0; |
|
|
|
return *r == data; |
|
} |
|
|
|
/** |
|
* devm_pinctrl_register() - Resource managed version of pinctrl_register(). |
|
* @dev: parent device for this pin controller |
|
* @pctldesc: descriptor for this pin controller |
|
* @driver_data: private pin controller data for this pin controller |
|
* |
|
* Returns an error pointer if pincontrol register failed. Otherwise |
|
* it returns valid pinctrl handle. |
|
* |
|
* The pinctrl device will be automatically released when the device is unbound. |
|
*/ |
|
struct pinctrl_dev *devm_pinctrl_register(struct device *dev, |
|
struct pinctrl_desc *pctldesc, |
|
void *driver_data) |
|
{ |
|
struct pinctrl_dev **ptr, *pctldev; |
|
|
|
ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL); |
|
if (!ptr) |
|
return ERR_PTR(-ENOMEM); |
|
|
|
pctldev = pinctrl_register(pctldesc, dev, driver_data); |
|
if (IS_ERR(pctldev)) { |
|
devres_free(ptr); |
|
return pctldev; |
|
} |
|
|
|
*ptr = pctldev; |
|
devres_add(dev, ptr); |
|
|
|
return pctldev; |
|
} |
|
EXPORT_SYMBOL_GPL(devm_pinctrl_register); |
|
|
|
/** |
|
* devm_pinctrl_register_and_init() - Resource managed pinctrl register and init |
|
* @dev: parent device for this pin controller |
|
* @pctldesc: descriptor for this pin controller |
|
* @driver_data: private pin controller data for this pin controller |
|
* @pctldev: pin controller device |
|
* |
|
* Returns zero on success or an error number on failure. |
|
* |
|
* The pinctrl device will be automatically released when the device is unbound. |
|
*/ |
|
int devm_pinctrl_register_and_init(struct device *dev, |
|
struct pinctrl_desc *pctldesc, |
|
void *driver_data, |
|
struct pinctrl_dev **pctldev) |
|
{ |
|
struct pinctrl_dev **ptr; |
|
int error; |
|
|
|
ptr = devres_alloc(devm_pinctrl_dev_release, sizeof(*ptr), GFP_KERNEL); |
|
if (!ptr) |
|
return -ENOMEM; |
|
|
|
error = pinctrl_register_and_init(pctldesc, dev, driver_data, pctldev); |
|
if (error) { |
|
devres_free(ptr); |
|
return error; |
|
} |
|
|
|
*ptr = *pctldev; |
|
devres_add(dev, ptr); |
|
|
|
return 0; |
|
} |
|
EXPORT_SYMBOL_GPL(devm_pinctrl_register_and_init); |
|
|
|
/** |
|
* devm_pinctrl_unregister() - Resource managed version of pinctrl_unregister(). |
|
* @dev: device for which which resource was allocated |
|
* @pctldev: the pinctrl device to unregister. |
|
*/ |
|
void devm_pinctrl_unregister(struct device *dev, struct pinctrl_dev *pctldev) |
|
{ |
|
WARN_ON(devres_release(dev, devm_pinctrl_dev_release, |
|
devm_pinctrl_dev_match, pctldev)); |
|
} |
|
EXPORT_SYMBOL_GPL(devm_pinctrl_unregister); |
|
|
|
static int __init pinctrl_init(void) |
|
{ |
|
pr_info("initialized pinctrl subsystem\n"); |
|
pinctrl_init_debugfs(); |
|
return 0; |
|
} |
|
|
|
/* init early since many drivers really need to initialized pinmux early */ |
|
core_initcall(pinctrl_init);
|
|
|