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porting kernel gpio subsystem
Signed-off-by: IotaHydrae <writeforever@foxmail.com>
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‎software/epink-lvgl/CMakeLists.txt‎

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@@ -30,6 +30,7 @@ file(GLOB_RECURSE SOURCES "lvgl/src/*.c"
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"net/*.c"
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"misc/*.c"
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"fs/*.c"
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"drivers/gpio/*.c"
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"drivers/video/*.c"
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"drivers/sensors/*.c"
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"drivers/i2c/*.c"

‎software/epink-lvgl/drivers/gpio/gpiolib.c‎

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/**
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* @file gpiolib.c
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* @author IotaHydrae (writeforever@foxmail.com)
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* @brief
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* @version 0.1
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* @date 2023-03-30
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*
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* MIT License
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*
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* Copyright 2022 IotaHydrae(writeforever@foxmail.com)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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*
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*/
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#include <linux/device.h>
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#include <linux/gpio/driver.h>
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#include "gpiolib.h"
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int gpiochip_add(struct gpio_chip *gc)
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{
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unsigned long flags;
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unsigned int i;
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u32 ngpios = 0;
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int base = 0;
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int ret = 0;
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return 0;
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}

‎software/epink-lvgl/drivers/gpio/gpiolib.h‎

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/**
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* @file gpiolib.h
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* @author IotaHydrae (writeforever@foxmail.com)
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* @brief
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* @version 0.1
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* @date 2023-03-30
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*
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* MIT License
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*
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* Copyright 2022 IotaHydrae(writeforever@foxmail.com)
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in all
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* copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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*
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*/
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/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Internal GPIO functions.
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*
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* Copyright (C) 2013, Intel Corporation
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* Copyright (C) 2023, iotahydrae
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* Author: Mika Westerberg <mika.westerberg@linux.intel.com>
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*/
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#ifndef GPIOLIB_H
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#define GPIOLIB_H
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#include <common/types.h>
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#include <common/list.h>
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#include <linux/device.h>
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#define GPIOCHIP_NAME "gpiochip"
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struct gpio_device;
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struct gpio_desc;
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/**
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* struct gpio_device - internal state container for GPIO devices
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* @dev: the GPIO device struct
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* @chrdev: character device for the GPIO device
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* @id: numerical ID number for the GPIO chip
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* @mockdev: class device used by the deprecated sysfs interface (may be
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* NULL)
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* @owner: helps prevent removal of modules exporting active GPIOs
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* @chip: pointer to the corresponding gpiochip, holding static
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* data for this device
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* @descs: array of ngpio descriptors.
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* @ngpio: the number of GPIO lines on this GPIO device, equal to the size
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* of the @descs array.
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* @base: GPIO base in the DEPRECATED global Linux GPIO numberspace, assigned
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* at device creation time.
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* @label: a descriptive name for the GPIO device, such as the part number
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* or name of the IP component in a System on Chip.
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* @data: per-instance data assigned by the driver
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* @list: links gpio_device:s together for traversal
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* @notifier: used to notify subscribers about lines being requested, released
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* or reconfigured
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* @sem: protects the structure from a NULL-pointer dereference of @chip by
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* user-space operations when the device gets unregistered during
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* a hot-unplug event
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* @pin_ranges: range of pins served by the GPIO driver
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*
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* This state container holds most of the runtime variable data
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* for a GPIO device and can hold references and live on after the
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* GPIO chip has been removed, if it is still being used from
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* userspace.
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*/
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struct gpio_device {
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struct device dev;
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// struct cdev chrdev;
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int id;
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struct device *mockdev;
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// struct module *owner;
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struct gpio_chip *chip;
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// struct gpio_desc *descs;
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int base;
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u16 ngpio;
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const char *label;
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void *data;
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struct list_head list;
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// struct blocking_notifier_head notifier;
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// struct rw_semaphore sem;
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#ifdef CONFIG_PINCTRL
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/*
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* If CONFIG_PINCTRL is enabled, then gpio controllers can optionally
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* describe the actual pin range which they serve in an SoC. This
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* information would be used by pinctrl subsystem to configure
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* corresponding pins for gpio usage.
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*/
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struct list_head pin_ranges;
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#endif
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};
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/**
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* struct gpio_desc - Opaque descriptor for a GPIO
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*
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* @gdev: Pointer to the parent GPIO device
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* @flags: Binary descriptor flags
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* @label: Name of the consumer
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* @name: Line name
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* @hog: Pointer to the device node that hogs this line (if any)
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* @debounce_period_us: Debounce period in microseconds
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*
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* These are obtained using gpiod_get() and are preferable to the old
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* integer-based handles.
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*
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* Contrary to integers, a pointer to a &struct gpio_desc is guaranteed to be
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* valid until the GPIO is released.
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*/
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struct gpio_desc {
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struct gpio_device *gdev;
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unsigned long flags;
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/* flag symbols are bit numbers */
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#define FLAG_REQUESTED 0
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#define FLAG_IS_OUT 1
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#define FLAG_EXPORT 2 /* protected by sysfs_lock */
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#define FLAG_SYSFS 3 /* exported via /sys/class/gpio/control */
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#define FLAG_ACTIVE_LOW 6 /* value has active low */
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#define FLAG_OPEN_DRAIN 7 /* Gpio is open drain type */
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#define FLAG_OPEN_SOURCE 8 /* Gpio is open source type */
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#define FLAG_USED_AS_IRQ 9 /* GPIO is connected to an IRQ */
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#define FLAG_IRQ_IS_ENABLED 10 /* GPIO is connected to an enabled IRQ */
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#define FLAG_IS_HOGGED 11 /* GPIO is hogged */
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#define FLAG_TRANSITORY 12 /* GPIO may lose value in sleep or reset */
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#define FLAG_PULL_UP 13 /* GPIO has pull up enabled */
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#define FLAG_PULL_DOWN 14 /* GPIO has pull down enabled */
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#define FLAG_BIAS_DISABLE 15 /* GPIO has pull disabled */
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#define FLAG_EDGE_RISING 16 /* GPIO CDEV detects rising edge events */
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#define FLAG_EDGE_FALLING 17 /* GPIO CDEV detects falling edge events */
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#define FLAG_EVENT_CLOCK_REALTIME 18 /* GPIO CDEV reports REALTIME timestamps in events */
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#define FLAG_EVENT_CLOCK_HTE 19 /* GPIO CDEV reports hardware timestamps in events */
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/* Connection label */
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const char *label;
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/* Name of the GPIO */
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const char *name;
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#ifdef CONFIG_OF_DYNAMIC
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struct device_node *hog;
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#endif
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#ifdef CONFIG_GPIO_CDEV
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/* debounce period in microseconds */
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unsigned int debounce_period_us;
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#endif
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};
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int gpiod_request(struct gpio_desc *desc, const char *label);
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void gpiod_free(struct gpio_desc *desc);
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#endif

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