// SPDX-License-Identifier: GPL-2.0-only /* * Configurable virtual GPIO consumer module. * * Copyright (C) 2023-2024 Bartosz Golaszewski <[email protected]> */ #define pr_fmt(fmt) … #include <linux/array_size.h> #include <linux/atomic.h> #include <linux/bitmap.h> #include <linux/cleanup.h> #include <linux/completion.h> #include <linux/configfs.h> #include <linux/debugfs.h> #include <linux/device.h> #include <linux/err.h> #include <linux/gpio/consumer.h> #include <linux/gpio/machine.h> #include <linux/idr.h> #include <linux/interrupt.h> #include <linux/irq_work.h> #include <linux/limits.h> #include <linux/list.h> #include <linux/lockdep.h> #include <linux/mod_devicetable.h> #include <linux/module.h> #include <linux/mutex.h> #include <linux/notifier.h> #include <linux/of.h> #include <linux/overflow.h> #include <linux/platform_device.h> #include <linux/printk.h> #include <linux/property.h> #include <linux/slab.h> #include <linux/string_helpers.h> #include <linux/types.h> #define GPIO_VIRTUSER_NAME_BUF_LEN … static DEFINE_IDA(gpio_virtuser_ida); static struct dentry *gpio_virtuser_dbg_root; struct gpio_virtuser_attr_data { … }; struct gpio_virtuser_line_array_data { … }; struct gpio_virtuser_line_data { … }; struct gpio_virtuser_dbgfs_attr_descr { … }; struct gpio_virtuser_irq_work_context { … }; static struct gpio_virtuser_irq_work_context * to_gpio_virtuser_irq_work_context(struct irq_work *work) { … } static void gpio_virtuser_init_irq_work_context(struct gpio_virtuser_irq_work_context *ctx) { … } static void gpio_virtuser_irq_work_queue_sync(struct gpio_virtuser_irq_work_context *ctx) { … } static void gpio_virtuser_dbgfs_emit_value_array(char *buf, unsigned long *values, size_t num_values) { … } static void gpio_virtuser_get_value_array_atomic(struct irq_work *work) { … } static int gpio_virtuser_get_array_value(struct gpio_descs *descs, unsigned long *values, bool atomic) { … } static ssize_t gpio_virtuser_value_array_do_read(struct file *file, char __user *user_buf, size_t size, loff_t *ppos, bool atomic) { … } static int gpio_virtuser_dbgfs_parse_value_array(const char *buf, size_t len, unsigned long *values) { … } static void gpio_virtuser_set_value_array_atomic(struct irq_work *work) { … } static int gpio_virtuser_set_array_value(struct gpio_descs *descs, unsigned long *values, bool atomic) { … } static ssize_t gpio_virtuser_value_array_do_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos, bool atomic) { … } static ssize_t gpio_virtuser_value_array_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) { … } static ssize_t gpio_virtuser_value_array_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } static const struct file_operations gpio_virtuser_value_array_fops = …; static ssize_t gpio_virtuser_value_array_atomic_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) { … } static ssize_t gpio_virtuser_value_array_atomic_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } static const struct file_operations gpio_virtuser_value_array_atomic_fops = …; static void gpio_virtuser_do_get_direction_atomic(struct irq_work *work) { … } static int gpio_virtuser_get_direction_atomic(struct gpio_desc *desc) { … } static ssize_t gpio_virtuser_direction_do_read(struct file *file, char __user *user_buf, size_t size, loff_t *ppos, bool atomic) { … } static int gpio_virtuser_set_direction(struct gpio_desc *desc, int dir, int val) { … } static void gpio_virtuser_do_set_direction_atomic(struct irq_work *work) { … } static int gpio_virtuser_set_direction_atomic(struct gpio_desc *desc, int dir, int val) { … } static ssize_t gpio_virtuser_direction_do_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos, bool atomic) { … } static ssize_t gpio_virtuser_direction_read(struct file *file, char __user *user_buf, size_t size, loff_t *ppos) { … } static ssize_t gpio_virtuser_direction_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } static const struct file_operations gpio_virtuser_direction_fops = …; static ssize_t gpio_virtuser_direction_atomic_read(struct file *file, char __user *user_buf, size_t size, loff_t *ppos) { … } static ssize_t gpio_virtuser_direction_atomic_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } static const struct file_operations gpio_virtuser_direction_atomic_fops = …; static int gpio_virtuser_value_get(void *data, u64 *val) { … } static int gpio_virtuser_value_set(void *data, u64 val) { … } DEFINE_DEBUGFS_ATTRIBUTE(…); static void gpio_virtuser_get_value_atomic(struct irq_work *work) { … } static int gpio_virtuser_value_atomic_get(void *data, u64 *val) { … } static void gpio_virtuser_set_value_atomic(struct irq_work *work) { … } static int gpio_virtuser_value_atomic_set(void *data, u64 val) { … } DEFINE_DEBUGFS_ATTRIBUTE(…); static int gpio_virtuser_debounce_get(void *data, u64 *val) { … } static int gpio_virtuser_debounce_set(void *data, u64 val) { … } DEFINE_DEBUGFS_ATTRIBUTE(…); static ssize_t gpio_virtuser_consumer_read(struct file *file, char __user *user_buf, size_t size, loff_t *ppos) { … } static ssize_t gpio_virtuser_consumer_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { … } static const struct file_operations gpio_virtuser_consumer_fops = …; static int gpio_virtuser_interrupts_get(void *data, u64 *val) { … } static irqreturn_t gpio_virtuser_irq_handler(int irq, void *data) { … } static int gpio_virtuser_interrupts_set(void *data, u64 val) { … } DEFINE_DEBUGFS_ATTRIBUTE(…); static const struct gpio_virtuser_dbgfs_attr_descr gpio_virtuser_line_array_dbgfs_attrs[] = …; static const struct gpio_virtuser_dbgfs_attr_descr gpio_virtuser_line_dbgfs_attrs[] = …; static int gpio_virtuser_create_debugfs_attrs( const struct gpio_virtuser_dbgfs_attr_descr *attr, size_t num_attrs, struct dentry *parent, void *data) { … } static int gpio_virtuser_dbgfs_init_line_array_attrs(struct device *dev, struct gpio_descs *descs, const char *id, struct dentry *dbgfs_entry) { … } static int gpio_virtuser_dbgfs_init_line_attrs(struct device *dev, struct gpio_desc *desc, const char *id, unsigned int index, struct dentry *dbgfs_entry) { … } static void gpio_virtuser_debugfs_remove(void *data) { … } static int gpio_virtuser_prop_is_gpio(struct property *prop) { … } /* * If this is an OF-based system, then we iterate over properties and consider * all whose names end in "-gpios". For configfs we expect an additional string * array property - "gpio-virtuser,ids" - containing the list of all GPIO IDs * to request. */ static int gpio_virtuser_count_ids(struct device *dev) { … } static int gpio_virtuser_get_ids(struct device *dev, const char **ids, int num_ids) { … } static int gpio_virtuser_probe(struct platform_device *pdev) { … } static const struct of_device_id gpio_virtuser_of_match[] = …; MODULE_DEVICE_TABLE(of, gpio_virtuser_of_match); static struct platform_driver gpio_virtuser_driver = …; struct gpio_virtuser_device { … }; static int gpio_virtuser_bus_notifier_call(struct notifier_block *nb, unsigned long action, void *data) { … } static struct gpio_virtuser_device * to_gpio_virtuser_device(struct config_item *item) { … } static bool gpio_virtuser_device_is_live(struct gpio_virtuser_device *dev) { … } struct gpio_virtuser_lookup { … }; static struct gpio_virtuser_lookup * to_gpio_virtuser_lookup(struct config_item *item) { … } struct gpio_virtuser_lookup_entry { … }; static struct gpio_virtuser_lookup_entry * to_gpio_virtuser_lookup_entry(struct config_item *item) { … } static ssize_t gpio_virtuser_lookup_entry_config_key_show(struct config_item *item, char *page) { … } static ssize_t gpio_virtuser_lookup_entry_config_key_store(struct config_item *item, const char *page, size_t count) { … } CONFIGFS_ATTR(…); static ssize_t gpio_virtuser_lookup_entry_config_offset_show(struct config_item *item, char *page) { … } static ssize_t gpio_virtuser_lookup_entry_config_offset_store(struct config_item *item, const char *page, size_t count) { … } CONFIGFS_ATTR(…); static enum gpio_lookup_flags gpio_virtuser_lookup_get_flags(struct config_item *item) { … } static ssize_t gpio_virtuser_lookup_entry_config_drive_show(struct config_item *item, char *page) { … } static ssize_t gpio_virtuser_lookup_entry_config_drive_store(struct config_item *item, const char *page, size_t count) { … } CONFIGFS_ATTR(…); static ssize_t gpio_virtuser_lookup_entry_config_pull_show(struct config_item *item, char *page) { … } static ssize_t gpio_virtuser_lookup_entry_config_pull_store(struct config_item *item, const char *page, size_t count) { … } CONFIGFS_ATTR(…); static ssize_t gpio_virtuser_lookup_entry_config_active_low_show(struct config_item *item, char *page) { … } static ssize_t gpio_virtuser_lookup_entry_config_active_low_store(struct config_item *item, const char *page, size_t count) { … } CONFIGFS_ATTR(…); static ssize_t gpio_virtuser_lookup_entry_config_transitory_show(struct config_item *item, char *page) { … } static ssize_t gpio_virtuser_lookup_entry_config_transitory_store(struct config_item *item, const char *page, size_t count) { … } CONFIGFS_ATTR(…); static struct configfs_attribute *gpio_virtuser_lookup_entry_config_attrs[] = …; static ssize_t gpio_virtuser_device_config_dev_name_show(struct config_item *item, char *page) { … } CONFIGFS_ATTR_RO(…); static ssize_t gpio_virtuser_device_config_live_show(struct config_item *item, char *page) { … } static size_t gpio_virtuser_get_lookup_count(struct gpio_virtuser_device *dev) { … } static int gpio_virtuser_make_lookup_table(struct gpio_virtuser_device *dev) { … } static struct fwnode_handle * gpio_virtuser_make_device_swnode(struct gpio_virtuser_device *dev) { … } static int gpio_virtuser_device_activate(struct gpio_virtuser_device *dev) { … } static void gpio_virtuser_device_deactivate(struct gpio_virtuser_device *dev) { … } static ssize_t gpio_virtuser_device_config_live_store(struct config_item *item, const char *page, size_t count) { … } CONFIGFS_ATTR(…); static struct configfs_attribute *gpio_virtuser_device_config_attrs[] = …; static void gpio_virtuser_lookup_entry_config_group_release(struct config_item *item) { … } static struct configfs_item_operations gpio_virtuser_lookup_entry_config_item_ops = …; static const struct config_item_type gpio_virtuser_lookup_entry_config_group_type = …; static struct config_group * gpio_virtuser_make_lookup_entry_group(struct config_group *group, const char *name) { … } static void gpio_virtuser_lookup_config_group_release(struct config_item *item) { … } static struct configfs_item_operations gpio_virtuser_lookup_config_item_ops = …; static struct configfs_group_operations gpio_virtuser_lookup_config_group_ops = …; static const struct config_item_type gpio_virtuser_lookup_config_group_type = …; static struct config_group * gpio_virtuser_make_lookup_group(struct config_group *group, const char *name) { … } static void gpio_virtuser_device_config_group_release(struct config_item *item) { … } static struct configfs_item_operations gpio_virtuser_device_config_item_ops = …; static struct configfs_group_operations gpio_virtuser_device_config_group_ops = …; static const struct config_item_type gpio_virtuser_device_config_group_type = …; static struct config_group * gpio_virtuser_config_make_device_group(struct config_group *group, const char *name) { … } static struct configfs_group_operations gpio_virtuser_config_group_ops = …; static const struct config_item_type gpio_virtuser_config_type = …; static struct configfs_subsystem gpio_virtuser_config_subsys = …; static int __init gpio_virtuser_init(void) { … } module_init(…) …; static void __exit gpio_virtuser_exit(void) { … } module_exit(gpio_virtuser_exit); MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …;
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