Chapter 2. Device drivers infrastructure

Table of Contents

The Basic Device Driver-Model Structures
Device Drivers Base
Device Drivers DMA Management
Device Drivers Power Management
Device Drivers ACPI Support
Device drivers PnP support
Userspace IO devices

The Basic Device Driver-Model Structures

struct bus_type — The bus type of the device
enum probe_type — device driver probe type to try Device drivers may opt in for special handling of their respective probe routines. This tells the core what to expect and prefer.
struct device_driver — The basic device driver structure
struct subsys_interface — interfaces to device functions
struct class — device classes
struct device — The basic device structure
module_driver — Helper macro for drivers that don't do anything special in module init/exit. This eliminates a lot of boilerplate. Each module may only use this macro once, and calling it replaces module_init and module_exit.
builtin_driver — Helper macro for drivers that don't do anything special in init and have no exit. This eliminates some boilerplate. Each driver may only use this macro once, and calling it replaces device_initcall (or in some cases, the legacy __initcall). This is meant to be a direct parallel of module_driver above but without the __exit stuff that is not used for builtin cases.