drivers/gpio/gpio-sim.c

File Facts

System

Linux kernel

Corpus path

drivers/gpio/gpio-sim.c

Extension

.c

Size

40083 bytes

Lines

1645

Domain

Driver Families

Bucket

drivers/gpio

Inferred role

Driver Families: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/array_size.h
• linux/bitmap.h
• linux/cleanup.h
• linux/configfs.h
• linux/device.h
• linux/err.h
• linux/gpio/consumer.h
• linux/gpio/driver.h
• linux/gpio/machine.h
• linux/idr.h
• linux/interrupt.h
• linux/irq.h
• linux/irq_sim.h
• linux/list.h
• linux/lockdep.h
• linux/minmax.h
• linux/mod_devicetable.h
• linux/module.h
• linux/mutex.h
• linux/notifier.h
• linux/platform_device.h
• linux/property.h
• linux/seq_file.h
• linux/slab.h
• linux/string.h
• linux/string_helpers.h
• linux/sysfs.h
• linux/types.h

Detected Declarations

• struct gpio_sim_chip
• struct gpio_sim_attribute
• struct gpio_sim_device
• struct gpio_sim_bank
• struct gpio_sim_hog
• struct gpio_sim_line
• struct gpio_sim_hog
• struct gpio_sim_chip_name_ctx
• function to_gpio_sim_attr
• function gpio_sim_apply_pull
• function gpio_sim_get
• function gpio_sim_set
• function gpio_sim_get_multiple
• function gpio_sim_set_multiple
• function gpio_sim_direction_output
• function scoped_guard
• function gpio_sim_direction_input
• function gpio_sim_get_direction
• function gpio_sim_set_config
• function gpio_sim_to_irq
• function gpio_sim_request
• function gpio_sim_free
• function scoped_guard
• function gpio_sim_irq_requested
• function gpio_sim_irq_released
• function gpio_sim_dbg_show
• function gpio_sim_sysfs_val_show
• function gpio_sim_sysfs_val_store
• function gpio_sim_sysfs_pull_show
• function gpio_sim_sysfs_pull_store
• function gpio_sim_put_device
• function gpio_sim_dispose_mappings
• function gpio_sim_sysfs_remove
• function gpio_sim_setup_sysfs
• function gpio_sim_add_bank
• function gpio_sim_probe
• function device_for_each_child_node_scoped
• function gpio_sim_bank_has_label
• function gpio_sim_bank_get_device
• function gpio_sim_line_get_device
• function gpio_sim_device_is_live
• function gpio_sim_device_config_dev_name_show
• function gpio_sim_device_config_live_show
• function gpio_sim_get_line_names_size
• function list_for_each_entry
• function gpio_sim_set_line_names
• function list_for_each_entry
• function gpio_sim_get_reserved_ranges_size

Annotated Snippet

module_init(gpio_sim_init);

static void __exit gpio_sim_exit(void)
{
	configfs_unregister_subsystem(&gpio_sim_config_subsys);
	mutex_destroy(&gpio_sim_config_subsys.su_mutex);
	platform_driver_unregister(&gpio_sim_driver);
}
module_exit(gpio_sim_exit);

MODULE_AUTHOR("Bartosz Golaszewski <brgl@bgdev.pl>");
MODULE_DESCRIPTION("GPIO Simulator Module");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/array_size.h`, `linux/bitmap.h`, `linux/cleanup.h`, `linux/configfs.h`, `linux/device.h`, `linux/err.h`, `linux/gpio/consumer.h`, `linux/gpio/driver.h`.
• Detected declarations: `struct gpio_sim_chip`, `struct gpio_sim_attribute`, `struct gpio_sim_device`, `struct gpio_sim_bank`, `struct gpio_sim_hog`, `struct gpio_sim_line`, `struct gpio_sim_hog`, `struct gpio_sim_chip_name_ctx`, `function to_gpio_sim_attr`, `function gpio_sim_apply_pull`.
• Atlas domain: Driver Families / drivers/gpio.
• Implementation status: integration implementation candidate.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.