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![Rafał Miłecki](/assets/img/avatar_default.png)
Generic code doesn't modify those strings and .get_function_groups callback has that extra "const" as well. This allows more flexibility in GENERIC_PINMUX_FUNCTIONS users. Signed-off-by: Rafał Miłecki <rafal@milecki.pl> Link: https://lore.kernel.org/r/20211216162206.8027-4-zajec5@gmail.com Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
956 lines
24 KiB
C
956 lines
24 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Core driver for the pin muxing portions of 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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#define pr_fmt(fmt) "pinmux core: " fmt
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#include <linux/ctype.h>
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#include <linux/kernel.h>
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#include <linux/module.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/radix-tree.h>
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#include <linux/err.h>
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#include <linux/list.h>
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#include <linux/string.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/machine.h>
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#include <linux/pinctrl/pinmux.h>
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#include "core.h"
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#include "pinmux.h"
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int pinmux_check_ops(struct pinctrl_dev *pctldev)
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{
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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unsigned nfuncs;
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unsigned selector = 0;
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/* Check that we implement required operations */
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if (!ops ||
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!ops->get_functions_count ||
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!ops->get_function_name ||
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!ops->get_function_groups ||
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!ops->set_mux) {
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dev_err(pctldev->dev, "pinmux ops lacks necessary functions\n");
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return -EINVAL;
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}
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/* Check that all functions registered have names */
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nfuncs = ops->get_functions_count(pctldev);
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while (selector < nfuncs) {
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const char *fname = ops->get_function_name(pctldev,
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selector);
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if (!fname) {
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dev_err(pctldev->dev, "pinmux ops has no name for function%u\n",
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selector);
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return -EINVAL;
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}
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selector++;
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}
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return 0;
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}
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int pinmux_validate_map(const struct pinctrl_map *map, int i)
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{
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if (!map->data.mux.function) {
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pr_err("failed to register map %s (%d): no function given\n",
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map->name, i);
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return -EINVAL;
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}
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return 0;
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}
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/**
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* pinmux_can_be_used_for_gpio() - check if a specific pin
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* is either muxed to a different function or used as gpio.
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*
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* @pctldev: the associated pin controller device
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* @pin: the pin number in the global pin space
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*
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* Controllers not defined as strict will always return true,
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* menaning that the gpio can be used.
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*/
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bool pinmux_can_be_used_for_gpio(struct pinctrl_dev *pctldev, unsigned pin)
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{
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struct pin_desc *desc = pin_desc_get(pctldev, pin);
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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/* Can't inspect pin, assume it can be used */
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if (!desc || !ops)
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return true;
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if (ops->strict && desc->mux_usecount)
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return false;
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return !(ops->strict && !!desc->gpio_owner);
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}
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/**
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* pin_request() - request a single pin to be muxed in, typically for GPIO
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* @pctldev: the associated pin controller device
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* @pin: the pin number in the global pin space
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* @owner: a representation of the owner of this pin; typically the device
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* name that controls its mux function, or the requested GPIO name
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* @gpio_range: the range matching the GPIO pin if this is a request for a
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* single GPIO pin
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*/
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static int pin_request(struct pinctrl_dev *pctldev,
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int pin, const char *owner,
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struct pinctrl_gpio_range *gpio_range)
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{
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struct pin_desc *desc;
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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int status = -EINVAL;
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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,
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"pin %d is not registered so it cannot be requested\n",
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pin);
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goto out;
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}
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dev_dbg(pctldev->dev, "request pin %d (%s) for %s\n",
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pin, desc->name, owner);
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if ((!gpio_range || ops->strict) &&
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desc->mux_usecount && strcmp(desc->mux_owner, owner)) {
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dev_err(pctldev->dev,
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"pin %s already requested by %s; cannot claim for %s\n",
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desc->name, desc->mux_owner, owner);
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goto out;
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}
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if ((gpio_range || ops->strict) && desc->gpio_owner) {
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dev_err(pctldev->dev,
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"pin %s already requested by %s; cannot claim for %s\n",
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desc->name, desc->gpio_owner, owner);
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goto out;
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}
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if (gpio_range) {
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desc->gpio_owner = owner;
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} else {
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desc->mux_usecount++;
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if (desc->mux_usecount > 1)
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return 0;
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desc->mux_owner = owner;
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}
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/* Let each pin increase references to this module */
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if (!try_module_get(pctldev->owner)) {
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dev_err(pctldev->dev,
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"could not increase module refcount for pin %d\n",
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pin);
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status = -EINVAL;
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goto out_free_pin;
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}
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/*
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* If there is no kind of request function for the pin we just assume
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* we got it by default and proceed.
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*/
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if (gpio_range && ops->gpio_request_enable)
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/* This requests and enables a single GPIO pin */
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status = ops->gpio_request_enable(pctldev, gpio_range, pin);
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else if (ops->request)
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status = ops->request(pctldev, pin);
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else
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status = 0;
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if (status) {
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dev_err(pctldev->dev, "request() failed for pin %d\n", pin);
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module_put(pctldev->owner);
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}
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out_free_pin:
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if (status) {
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if (gpio_range) {
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desc->gpio_owner = NULL;
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} else {
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desc->mux_usecount--;
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if (!desc->mux_usecount)
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desc->mux_owner = NULL;
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}
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}
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out:
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if (status)
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dev_err(pctldev->dev, "pin-%d (%s) status %d\n",
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pin, owner, status);
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return status;
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}
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/**
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* pin_free() - release a single muxed in pin so something else can be muxed
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* @pctldev: pin controller device handling this pin
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* @pin: the pin to free
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* @gpio_range: the range matching the GPIO pin if this is a request for a
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* single GPIO pin
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*
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* This function returns a pointer to the previous owner. This is used
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* for callers that dynamically allocate an owner name so it can be freed
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* once the pin is free. This is done for GPIO request functions.
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*/
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static const char *pin_free(struct pinctrl_dev *pctldev, int pin,
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struct pinctrl_gpio_range *gpio_range)
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{
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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struct pin_desc *desc;
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const char *owner;
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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,
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"pin is not registered so it cannot be freed\n");
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return NULL;
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}
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if (!gpio_range) {
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/*
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* A pin should not be freed more times than allocated.
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*/
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if (WARN_ON(!desc->mux_usecount))
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return NULL;
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desc->mux_usecount--;
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if (desc->mux_usecount)
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return NULL;
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}
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/*
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* If there is no kind of request function for the pin we just assume
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* we got it by default and proceed.
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*/
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if (gpio_range && ops->gpio_disable_free)
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ops->gpio_disable_free(pctldev, gpio_range, pin);
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else if (ops->free)
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ops->free(pctldev, pin);
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if (gpio_range) {
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owner = desc->gpio_owner;
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desc->gpio_owner = NULL;
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} else {
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owner = desc->mux_owner;
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desc->mux_owner = NULL;
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desc->mux_setting = NULL;
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}
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module_put(pctldev->owner);
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return owner;
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}
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/**
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* pinmux_request_gpio() - request pinmuxing for a GPIO pin
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* @pctldev: pin controller device affected
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* @pin: the pin to mux in for GPIO
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* @range: the applicable GPIO range
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* @gpio: number of requested GPIO
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*/
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int pinmux_request_gpio(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range,
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unsigned pin, unsigned gpio)
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{
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const char *owner;
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int ret;
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/* Conjure some name stating what chip and pin this is taken by */
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owner = kasprintf(GFP_KERNEL, "%s:%d", range->name, gpio);
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if (!owner)
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return -ENOMEM;
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ret = pin_request(pctldev, pin, owner, range);
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if (ret < 0)
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kfree(owner);
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return ret;
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}
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/**
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* pinmux_free_gpio() - release a pin from GPIO muxing
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* @pctldev: the pin controller device for the pin
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* @pin: the affected currently GPIO-muxed in pin
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* @range: applicable GPIO range
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*/
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void pinmux_free_gpio(struct pinctrl_dev *pctldev, unsigned pin,
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struct pinctrl_gpio_range *range)
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{
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const char *owner;
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owner = pin_free(pctldev, pin, range);
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kfree(owner);
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}
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/**
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* pinmux_gpio_direction() - set the direction of a single muxed-in GPIO pin
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* @pctldev: the pin controller handling this pin
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* @range: applicable GPIO range
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* @pin: the affected GPIO pin in this controller
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* @input: true if we set the pin as input, false for output
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*/
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int pinmux_gpio_direction(struct pinctrl_dev *pctldev,
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struct pinctrl_gpio_range *range,
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unsigned pin, bool input)
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{
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const struct pinmux_ops *ops;
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int ret;
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ops = pctldev->desc->pmxops;
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if (ops->gpio_set_direction)
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ret = ops->gpio_set_direction(pctldev, range, pin, input);
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else
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ret = 0;
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return ret;
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}
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static int pinmux_func_name_to_selector(struct pinctrl_dev *pctldev,
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const char *function)
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{
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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unsigned nfuncs = ops->get_functions_count(pctldev);
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unsigned selector = 0;
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/* See if this pctldev has this function */
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while (selector < nfuncs) {
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const char *fname = ops->get_function_name(pctldev, selector);
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if (!strcmp(function, fname))
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return selector;
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selector++;
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}
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return -EINVAL;
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}
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int pinmux_map_to_setting(const struct pinctrl_map *map,
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struct pinctrl_setting *setting)
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{
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struct pinctrl_dev *pctldev = setting->pctldev;
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const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
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char const * const *groups;
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unsigned num_groups;
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int ret;
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const char *group;
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if (!pmxops) {
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dev_err(pctldev->dev, "does not support mux function\n");
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return -EINVAL;
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}
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ret = pinmux_func_name_to_selector(pctldev, map->data.mux.function);
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if (ret < 0) {
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dev_err(pctldev->dev, "invalid function %s in map table\n",
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map->data.mux.function);
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return ret;
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}
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setting->data.mux.func = ret;
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ret = pmxops->get_function_groups(pctldev, setting->data.mux.func,
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&groups, &num_groups);
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if (ret < 0) {
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dev_err(pctldev->dev, "can't query groups for function %s\n",
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map->data.mux.function);
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return ret;
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}
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if (!num_groups) {
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dev_err(pctldev->dev,
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"function %s can't be selected on any group\n",
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map->data.mux.function);
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return -EINVAL;
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}
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if (map->data.mux.group) {
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group = map->data.mux.group;
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ret = match_string(groups, num_groups, group);
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if (ret < 0) {
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dev_err(pctldev->dev,
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"invalid group \"%s\" for function \"%s\"\n",
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group, map->data.mux.function);
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return ret;
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}
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} else {
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group = groups[0];
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}
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ret = pinctrl_get_group_selector(pctldev, group);
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if (ret < 0) {
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dev_err(pctldev->dev, "invalid group %s in map table\n",
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map->data.mux.group);
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return ret;
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}
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setting->data.mux.group = ret;
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return 0;
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}
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void pinmux_free_setting(const struct pinctrl_setting *setting)
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{
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/* This function is currently unused */
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}
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int pinmux_enable_setting(const struct pinctrl_setting *setting)
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{
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struct pinctrl_dev *pctldev = setting->pctldev;
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const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
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const struct pinmux_ops *ops = pctldev->desc->pmxops;
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int ret = 0;
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const unsigned *pins = NULL;
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unsigned num_pins = 0;
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int i;
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struct pin_desc *desc;
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if (pctlops->get_group_pins)
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ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
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&pins, &num_pins);
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if (ret) {
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const char *gname;
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/* errors only affect debug data, so just warn */
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gname = pctlops->get_group_name(pctldev,
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setting->data.mux.group);
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dev_warn(pctldev->dev,
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"could not get pins for group %s\n",
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gname);
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num_pins = 0;
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}
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/* Try to allocate all pins in this group, one by one */
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for (i = 0; i < num_pins; i++) {
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ret = pin_request(pctldev, pins[i], setting->dev_name, NULL);
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if (ret) {
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const char *gname;
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const char *pname;
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desc = pin_desc_get(pctldev, pins[i]);
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pname = desc ? desc->name : "non-existing";
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gname = pctlops->get_group_name(pctldev,
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setting->data.mux.group);
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dev_err(pctldev->dev,
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"could not request pin %d (%s) from group %s "
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" on device %s\n",
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pins[i], pname, gname,
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pinctrl_dev_get_name(pctldev));
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goto err_pin_request;
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}
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}
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/* Now that we have acquired the pins, encode the mux setting */
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for (i = 0; i < num_pins; i++) {
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desc = pin_desc_get(pctldev, pins[i]);
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if (desc == NULL) {
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dev_warn(pctldev->dev,
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"could not get pin desc for pin %d\n",
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pins[i]);
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continue;
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}
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desc->mux_setting = &(setting->data.mux);
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}
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ret = ops->set_mux(pctldev, setting->data.mux.func,
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setting->data.mux.group);
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if (ret)
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goto err_set_mux;
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return 0;
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err_set_mux:
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for (i = 0; i < num_pins; i++) {
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desc = pin_desc_get(pctldev, pins[i]);
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if (desc)
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desc->mux_setting = NULL;
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}
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err_pin_request:
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/* On error release all taken pins */
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while (--i >= 0)
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pin_free(pctldev, pins[i], NULL);
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return ret;
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}
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void pinmux_disable_setting(const struct pinctrl_setting *setting)
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{
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struct pinctrl_dev *pctldev = setting->pctldev;
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const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
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int ret = 0;
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const unsigned *pins = NULL;
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unsigned num_pins = 0;
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int i;
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struct pin_desc *desc;
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if (pctlops->get_group_pins)
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ret = pctlops->get_group_pins(pctldev, setting->data.mux.group,
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&pins, &num_pins);
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if (ret) {
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const char *gname;
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/* errors only affect debug data, so just warn */
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gname = pctlops->get_group_name(pctldev,
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setting->data.mux.group);
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dev_warn(pctldev->dev,
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"could not get pins for group %s\n",
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gname);
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num_pins = 0;
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}
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/* Flag the descs that no setting is active */
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for (i = 0; i < num_pins; i++) {
|
|
desc = pin_desc_get(pctldev, pins[i]);
|
|
if (desc == NULL) {
|
|
dev_warn(pctldev->dev,
|
|
"could not get pin desc for pin %d\n",
|
|
pins[i]);
|
|
continue;
|
|
}
|
|
if (desc->mux_setting == &(setting->data.mux)) {
|
|
pin_free(pctldev, pins[i], NULL);
|
|
} else {
|
|
const char *gname;
|
|
|
|
gname = pctlops->get_group_name(pctldev,
|
|
setting->data.mux.group);
|
|
dev_warn(pctldev->dev,
|
|
"not freeing pin %d (%s) as part of "
|
|
"deactivating group %s - it is already "
|
|
"used for some other setting",
|
|
pins[i], desc->name, gname);
|
|
}
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
|
|
/* Called from pincontrol core */
|
|
static int pinmux_functions_show(struct seq_file *s, void *what)
|
|
{
|
|
struct pinctrl_dev *pctldev = s->private;
|
|
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
|
|
unsigned nfuncs;
|
|
unsigned func_selector = 0;
|
|
|
|
if (!pmxops)
|
|
return 0;
|
|
|
|
mutex_lock(&pctldev->mutex);
|
|
nfuncs = pmxops->get_functions_count(pctldev);
|
|
while (func_selector < nfuncs) {
|
|
const char *func = pmxops->get_function_name(pctldev,
|
|
func_selector);
|
|
const char * const *groups;
|
|
unsigned num_groups;
|
|
int ret;
|
|
int i;
|
|
|
|
ret = pmxops->get_function_groups(pctldev, func_selector,
|
|
&groups, &num_groups);
|
|
if (ret) {
|
|
seq_printf(s, "function %s: COULD NOT GET GROUPS\n",
|
|
func);
|
|
func_selector++;
|
|
continue;
|
|
}
|
|
|
|
seq_printf(s, "function %d: %s, groups = [ ", func_selector, func);
|
|
for (i = 0; i < num_groups; i++)
|
|
seq_printf(s, "%s ", groups[i]);
|
|
seq_puts(s, "]\n");
|
|
|
|
func_selector++;
|
|
}
|
|
|
|
mutex_unlock(&pctldev->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int pinmux_pins_show(struct seq_file *s, void *what)
|
|
{
|
|
struct pinctrl_dev *pctldev = s->private;
|
|
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
|
|
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
|
|
unsigned i, pin;
|
|
|
|
if (!pmxops)
|
|
return 0;
|
|
|
|
seq_puts(s, "Pinmux settings per pin\n");
|
|
if (pmxops->strict)
|
|
seq_puts(s,
|
|
"Format: pin (name): mux_owner|gpio_owner (strict) hog?\n");
|
|
else
|
|
seq_puts(s,
|
|
"Format: pin (name): mux_owner gpio_owner hog?\n");
|
|
|
|
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;
|
|
bool is_hog = false;
|
|
|
|
pin = pctldev->desc->pins[i].number;
|
|
desc = pin_desc_get(pctldev, pin);
|
|
/* Skip if we cannot search the pin */
|
|
if (desc == NULL)
|
|
continue;
|
|
|
|
if (desc->mux_owner &&
|
|
!strcmp(desc->mux_owner, pinctrl_dev_get_name(pctldev)))
|
|
is_hog = true;
|
|
|
|
if (pmxops->strict) {
|
|
if (desc->mux_owner)
|
|
seq_printf(s, "pin %d (%s): device %s%s",
|
|
pin, desc->name, desc->mux_owner,
|
|
is_hog ? " (HOG)" : "");
|
|
else if (desc->gpio_owner)
|
|
seq_printf(s, "pin %d (%s): GPIO %s",
|
|
pin, desc->name, desc->gpio_owner);
|
|
else
|
|
seq_printf(s, "pin %d (%s): UNCLAIMED",
|
|
pin, desc->name);
|
|
} else {
|
|
/* For non-strict controllers */
|
|
seq_printf(s, "pin %d (%s): %s %s%s", pin, desc->name,
|
|
desc->mux_owner ? desc->mux_owner
|
|
: "(MUX UNCLAIMED)",
|
|
desc->gpio_owner ? desc->gpio_owner
|
|
: "(GPIO UNCLAIMED)",
|
|
is_hog ? " (HOG)" : "");
|
|
}
|
|
|
|
/* If mux: print function+group claiming the pin */
|
|
if (desc->mux_setting)
|
|
seq_printf(s, " function %s group %s\n",
|
|
pmxops->get_function_name(pctldev,
|
|
desc->mux_setting->func),
|
|
pctlops->get_group_name(pctldev,
|
|
desc->mux_setting->group));
|
|
else
|
|
seq_putc(s, '\n');
|
|
}
|
|
|
|
mutex_unlock(&pctldev->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void pinmux_show_map(struct seq_file *s, const struct pinctrl_map *map)
|
|
{
|
|
seq_printf(s, "group %s\nfunction %s\n",
|
|
map->data.mux.group ? map->data.mux.group : "(default)",
|
|
map->data.mux.function);
|
|
}
|
|
|
|
void pinmux_show_setting(struct seq_file *s,
|
|
const struct pinctrl_setting *setting)
|
|
{
|
|
struct pinctrl_dev *pctldev = setting->pctldev;
|
|
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
|
|
const struct pinctrl_ops *pctlops = pctldev->desc->pctlops;
|
|
|
|
seq_printf(s, "group: %s (%u) function: %s (%u)\n",
|
|
pctlops->get_group_name(pctldev, setting->data.mux.group),
|
|
setting->data.mux.group,
|
|
pmxops->get_function_name(pctldev, setting->data.mux.func),
|
|
setting->data.mux.func);
|
|
}
|
|
|
|
DEFINE_SHOW_ATTRIBUTE(pinmux_functions);
|
|
DEFINE_SHOW_ATTRIBUTE(pinmux_pins);
|
|
|
|
#define PINMUX_SELECT_MAX 128
|
|
static ssize_t pinmux_select(struct file *file, const char __user *user_buf,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
struct seq_file *sfile = file->private_data;
|
|
struct pinctrl_dev *pctldev = sfile->private;
|
|
const struct pinmux_ops *pmxops = pctldev->desc->pmxops;
|
|
const char *const *groups;
|
|
char *buf, *gname, *fname;
|
|
unsigned int num_groups;
|
|
int fsel, gsel, ret;
|
|
|
|
if (len > PINMUX_SELECT_MAX)
|
|
return -ENOMEM;
|
|
|
|
buf = kzalloc(PINMUX_SELECT_MAX, GFP_KERNEL);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
ret = strncpy_from_user(buf, user_buf, PINMUX_SELECT_MAX);
|
|
if (ret < 0)
|
|
goto exit_free_buf;
|
|
buf[len-1] = '\0';
|
|
|
|
/* remove leading and trailing spaces of input buffer */
|
|
gname = strstrip(buf);
|
|
if (*gname == '\0') {
|
|
ret = -EINVAL;
|
|
goto exit_free_buf;
|
|
}
|
|
|
|
/* find a separator which is a spacelike character */
|
|
for (fname = gname; !isspace(*fname); fname++) {
|
|
if (*fname == '\0') {
|
|
ret = -EINVAL;
|
|
goto exit_free_buf;
|
|
}
|
|
}
|
|
*fname = '\0';
|
|
|
|
/* drop extra spaces between function and group names */
|
|
fname = skip_spaces(fname + 1);
|
|
if (*fname == '\0') {
|
|
ret = -EINVAL;
|
|
goto exit_free_buf;
|
|
}
|
|
|
|
ret = pinmux_func_name_to_selector(pctldev, fname);
|
|
if (ret < 0) {
|
|
dev_err(pctldev->dev, "invalid function %s in map table\n", fname);
|
|
goto exit_free_buf;
|
|
}
|
|
fsel = ret;
|
|
|
|
ret = pmxops->get_function_groups(pctldev, fsel, &groups, &num_groups);
|
|
if (ret) {
|
|
dev_err(pctldev->dev, "no groups for function %d (%s)", fsel, fname);
|
|
goto exit_free_buf;
|
|
}
|
|
|
|
ret = match_string(groups, num_groups, gname);
|
|
if (ret < 0) {
|
|
dev_err(pctldev->dev, "invalid group %s", gname);
|
|
goto exit_free_buf;
|
|
}
|
|
|
|
ret = pinctrl_get_group_selector(pctldev, gname);
|
|
if (ret < 0) {
|
|
dev_err(pctldev->dev, "failed to get group selector for %s", gname);
|
|
goto exit_free_buf;
|
|
}
|
|
gsel = ret;
|
|
|
|
ret = pmxops->set_mux(pctldev, fsel, gsel);
|
|
if (ret) {
|
|
dev_err(pctldev->dev, "set_mux() failed: %d", ret);
|
|
goto exit_free_buf;
|
|
}
|
|
ret = len;
|
|
|
|
exit_free_buf:
|
|
kfree(buf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int pinmux_select_open(struct inode *inode, struct file *file)
|
|
{
|
|
return single_open(file, NULL, inode->i_private);
|
|
}
|
|
|
|
static const struct file_operations pinmux_select_ops = {
|
|
.owner = THIS_MODULE,
|
|
.open = pinmux_select_open,
|
|
.write = pinmux_select,
|
|
.llseek = no_llseek,
|
|
.release = single_release,
|
|
};
|
|
|
|
void pinmux_init_device_debugfs(struct dentry *devroot,
|
|
struct pinctrl_dev *pctldev)
|
|
{
|
|
debugfs_create_file("pinmux-functions", 0444,
|
|
devroot, pctldev, &pinmux_functions_fops);
|
|
debugfs_create_file("pinmux-pins", 0444,
|
|
devroot, pctldev, &pinmux_pins_fops);
|
|
debugfs_create_file("pinmux-select", 0200,
|
|
devroot, pctldev, &pinmux_select_ops);
|
|
}
|
|
|
|
#endif /* CONFIG_DEBUG_FS */
|
|
|
|
#ifdef CONFIG_GENERIC_PINMUX_FUNCTIONS
|
|
|
|
/**
|
|
* pinmux_generic_get_function_count() - returns number of functions
|
|
* @pctldev: pin controller device
|
|
*/
|
|
int pinmux_generic_get_function_count(struct pinctrl_dev *pctldev)
|
|
{
|
|
return pctldev->num_functions;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pinmux_generic_get_function_count);
|
|
|
|
/**
|
|
* pinmux_generic_get_function_name() - returns the function name
|
|
* @pctldev: pin controller device
|
|
* @selector: function number
|
|
*/
|
|
const char *
|
|
pinmux_generic_get_function_name(struct pinctrl_dev *pctldev,
|
|
unsigned int selector)
|
|
{
|
|
struct function_desc *function;
|
|
|
|
function = radix_tree_lookup(&pctldev->pin_function_tree,
|
|
selector);
|
|
if (!function)
|
|
return NULL;
|
|
|
|
return function->name;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pinmux_generic_get_function_name);
|
|
|
|
/**
|
|
* pinmux_generic_get_function_groups() - gets the function groups
|
|
* @pctldev: pin controller device
|
|
* @selector: function number
|
|
* @groups: array of pin groups
|
|
* @num_groups: number of pin groups
|
|
*/
|
|
int pinmux_generic_get_function_groups(struct pinctrl_dev *pctldev,
|
|
unsigned int selector,
|
|
const char * const **groups,
|
|
unsigned * const num_groups)
|
|
{
|
|
struct function_desc *function;
|
|
|
|
function = radix_tree_lookup(&pctldev->pin_function_tree,
|
|
selector);
|
|
if (!function) {
|
|
dev_err(pctldev->dev, "%s could not find function%i\n",
|
|
__func__, selector);
|
|
return -EINVAL;
|
|
}
|
|
*groups = function->group_names;
|
|
*num_groups = function->num_group_names;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pinmux_generic_get_function_groups);
|
|
|
|
/**
|
|
* pinmux_generic_get_function() - returns a function based on the number
|
|
* @pctldev: pin controller device
|
|
* @selector: function number
|
|
*/
|
|
struct function_desc *pinmux_generic_get_function(struct pinctrl_dev *pctldev,
|
|
unsigned int selector)
|
|
{
|
|
struct function_desc *function;
|
|
|
|
function = radix_tree_lookup(&pctldev->pin_function_tree,
|
|
selector);
|
|
if (!function)
|
|
return NULL;
|
|
|
|
return function;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pinmux_generic_get_function);
|
|
|
|
/**
|
|
* pinmux_generic_add_function() - adds a function group
|
|
* @pctldev: pin controller device
|
|
* @name: name of the function
|
|
* @groups: array of pin groups
|
|
* @num_groups: number of pin groups
|
|
* @data: pin controller driver specific data
|
|
*/
|
|
int pinmux_generic_add_function(struct pinctrl_dev *pctldev,
|
|
const char *name,
|
|
const char * const *groups,
|
|
const unsigned int num_groups,
|
|
void *data)
|
|
{
|
|
struct function_desc *function;
|
|
int selector;
|
|
|
|
if (!name)
|
|
return -EINVAL;
|
|
|
|
selector = pinmux_func_name_to_selector(pctldev, name);
|
|
if (selector >= 0)
|
|
return selector;
|
|
|
|
selector = pctldev->num_functions;
|
|
|
|
function = devm_kzalloc(pctldev->dev, sizeof(*function), GFP_KERNEL);
|
|
if (!function)
|
|
return -ENOMEM;
|
|
|
|
function->name = name;
|
|
function->group_names = groups;
|
|
function->num_group_names = num_groups;
|
|
function->data = data;
|
|
|
|
radix_tree_insert(&pctldev->pin_function_tree, selector, function);
|
|
|
|
pctldev->num_functions++;
|
|
|
|
return selector;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pinmux_generic_add_function);
|
|
|
|
/**
|
|
* pinmux_generic_remove_function() - removes a numbered function
|
|
* @pctldev: pin controller device
|
|
* @selector: function number
|
|
*
|
|
* Note that the caller must take care of locking.
|
|
*/
|
|
int pinmux_generic_remove_function(struct pinctrl_dev *pctldev,
|
|
unsigned int selector)
|
|
{
|
|
struct function_desc *function;
|
|
|
|
function = radix_tree_lookup(&pctldev->pin_function_tree,
|
|
selector);
|
|
if (!function)
|
|
return -ENOENT;
|
|
|
|
radix_tree_delete(&pctldev->pin_function_tree, selector);
|
|
devm_kfree(pctldev->dev, function);
|
|
|
|
pctldev->num_functions--;
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(pinmux_generic_remove_function);
|
|
|
|
/**
|
|
* pinmux_generic_free_functions() - removes all functions
|
|
* @pctldev: pin controller device
|
|
*
|
|
* Note that the caller must take care of locking. The pinctrl
|
|
* functions are allocated with devm_kzalloc() so no need to free
|
|
* them here.
|
|
*/
|
|
void pinmux_generic_free_functions(struct pinctrl_dev *pctldev)
|
|
{
|
|
struct radix_tree_iter iter;
|
|
void __rcu **slot;
|
|
|
|
radix_tree_for_each_slot(slot, &pctldev->pin_function_tree, &iter, 0)
|
|
radix_tree_delete(&pctldev->pin_function_tree, iter.index);
|
|
|
|
pctldev->num_functions = 0;
|
|
}
|
|
|
|
#endif /* CONFIG_GENERIC_PINMUX_FUNCTIONS */
|