// SPDX-License-Identifier: GPL-2.0-or-later /* * GPIO Testing Device Driver * * Copyright (C) 2014 Kamlakant Patel <[email protected]> * Copyright (C) 2015-2016 Bamvor Jian Zhang <[email protected]> * Copyright (C) 2017 Bartosz Golaszewski <[email protected]> */ #define pr_fmt(fmt) … #include <linux/cleanup.h> #include <linux/debugfs.h> #include <linux/device.h> #include <linux/gpio/driver.h> #include <linux/interrupt.h> #include <linux/irq.h> #include <linux/irq_sim.h> #include <linux/irqdomain.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/property.h> #include <linux/seq_file.h> #include <linux/slab.h> #include <linux/string_helpers.h> #include <linux/uaccess.h> #define GPIO_MOCKUP_MAX_GC … /* * We're storing two values per chip: the GPIO base and the number * of GPIO lines. */ #define GPIO_MOCKUP_MAX_RANGES … /* Maximum of four properties + the sentinel. */ #define GPIO_MOCKUP_MAX_PROP … /* * struct gpio_pin_status - structure describing a GPIO status * @dir: Configures direction of gpio as "in" or "out" * @value: Configures status of the gpio as 0(low) or 1(high) * @pull: Configures the current pull of the GPIO as 0 (pull-down) or * 1 (pull-up) * @requested: Request status of this GPIO */ struct gpio_mockup_line_status { … }; struct gpio_mockup_chip { … }; struct gpio_mockup_dbgfs_private { … }; static int gpio_mockup_ranges[GPIO_MOCKUP_MAX_RANGES]; static int gpio_mockup_num_ranges; module_param_array(…); static bool gpio_mockup_named_lines; module_param_named(gpio_mockup_named_lines, gpio_mockup_named_lines, bool, 0400); static struct dentry *gpio_mockup_dbg_dir; static int gpio_mockup_range_base(unsigned int index) { … } static int gpio_mockup_range_ngpio(unsigned int index) { … } static int __gpio_mockup_get(struct gpio_mockup_chip *chip, unsigned int offset) { … } static int gpio_mockup_get(struct gpio_chip *gc, unsigned int offset) { … } static int gpio_mockup_get_multiple(struct gpio_chip *gc, unsigned long *mask, unsigned long *bits) { … } static void __gpio_mockup_set(struct gpio_mockup_chip *chip, unsigned int offset, int value) { … } static void gpio_mockup_set(struct gpio_chip *gc, unsigned int offset, int value) { … } static void gpio_mockup_set_multiple(struct gpio_chip *gc, unsigned long *mask, unsigned long *bits) { … } static int gpio_mockup_apply_pull(struct gpio_mockup_chip *chip, unsigned int offset, int value) { … } static int gpio_mockup_set_config(struct gpio_chip *gc, unsigned int offset, unsigned long config) { … } static int gpio_mockup_dirout(struct gpio_chip *gc, unsigned int offset, int value) { … } static int gpio_mockup_dirin(struct gpio_chip *gc, unsigned int offset) { … } static int gpio_mockup_get_direction(struct gpio_chip *gc, unsigned int offset) { … } static int gpio_mockup_to_irq(struct gpio_chip *gc, unsigned int offset) { … } static int gpio_mockup_request(struct gpio_chip *gc, unsigned int offset) { … } static void gpio_mockup_free(struct gpio_chip *gc, unsigned int offset) { … } static ssize_t gpio_mockup_debugfs_read(struct file *file, char __user *usr_buf, size_t size, loff_t *ppos) { … } static ssize_t gpio_mockup_debugfs_write(struct file *file, const char __user *usr_buf, size_t size, loff_t *ppos) { … } static int gpio_mockup_debugfs_open(struct inode *inode, struct file *file) { … } /* * Each mockup chip is represented by a directory named after the chip's device * name under /sys/kernel/debug/gpio-mockup/. Each line is represented by * a file using the line's offset as the name under the chip's directory. * * Reading from the line's file yields the current *value*, writing to the * line's file changes the current *pull*. Default pull for mockup lines is * down. * * Examples: * - when a line pulled down is requested in output mode and driven high, its * value will return to 0 once it's released * - when the line is requested in output mode and driven high, writing 0 to * the corresponding debugfs file will change the pull to down but the * reported value will still be 1 until the line is released * - line requested in input mode always reports the same value as its pull * configuration * - when the line is requested in input mode and monitored for events, writing * the same value to the debugfs file will be a noop, while writing the * opposite value will generate a dummy interrupt with an appropriate edge */ static const struct file_operations gpio_mockup_debugfs_ops = …; static void gpio_mockup_debugfs_setup(struct device *dev, struct gpio_mockup_chip *chip) { … } static void gpio_mockup_debugfs_cleanup(void *data) { … } static void gpio_mockup_dispose_mappings(void *data) { … } static int gpio_mockup_probe(struct platform_device *pdev) { … } static const struct of_device_id gpio_mockup_of_match[] = …; MODULE_DEVICE_TABLE(of, gpio_mockup_of_match); static struct platform_driver gpio_mockup_driver = …; static struct platform_device *gpio_mockup_pdevs[GPIO_MOCKUP_MAX_GC]; static void gpio_mockup_unregister_pdevs(void) { … } static int __init gpio_mockup_register_chip(int idx) { … } static int __init gpio_mockup_init(void) { … } static void __exit gpio_mockup_exit(void) { … } module_init(…) …; module_exit(gpio_mockup_exit); MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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