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Driver implementer’s API guide¶

The kernel offers a wide variety of interfaces to support the development of device drivers. This document is an only somewhat organized collection of some of those interfaces — it will hopefully get better over time! The available subsections can be seen below.

General information for driver authors¶

This section contains documentation that should, at some point or other, be of interest to most developers working on device drivers.

Driver Basics
Driver Model
Device links
Device drivers infrastructure
ioctl based interfaces
CPU and Device Power Management

Useful support libraries¶

This section contains documentation that should, at some point or other, be of interest to most developers working on device drivers.

Early Userspace
Kernel Connector
Bus-Independent Device Accesses
Device Frequency Scaling
Buffer Sharing and Synchronization (dma-buf)
Component Helper for Aggregate Drivers
The io_mapping functions
Ordering I/O writes to memory-mapped addresses
The Userspace I/O HOWTO
VFIO Mediated devices
VFIO - “Virtual Function I/O”
Acceptance criteria for vfio-pci device specific driver variants
VFIO Selftests

Bus-level documentation¶

Auxiliary Bus
Compute Express Link
EISA bus support
Firewire (IEEE 1394) driver Interface Guide
I3C subsystem
ISA Drivers
MEN Chameleon Bus
The Linux PCI driver implementer’s API guide
The Linux RapidIO Subsystem
Linux kernel SLIMbus support
Linux USB API
Virtio
VME Device Drivers
W1: Dallas’ 1-wire bus
Xillybus driver for generic FPGA interface

Subsystem-specific APIs¶

Linux 802.11 Driver Developer’s Guide
ACPI Support
Kernel driver lp855x
The Common Clk Framework
Confidential Computing
Console Drivers
Crypto Drivers
DMAEngine documentation
The Linux kernel dpll subsystem
Error Detection And Correction (EDAC) Devices
Extcon Device Subsystem
Linux Firmware API
FPGA Subsystem
Frame Buffer Library
Managing Ownership of the Framebuffer Aperture
Generic Counter Interface
Generic Radix Page Table
General Purpose Input/Output (GPIO)
High Speed Synchronous Serial Interface (HSI)
The Linux Hardware Timestamping Engine (HTE)
Recoverable Hardware Error Tracking in vmcoreinfo
I²C and SMBus Subsystem
Industrial I/O
InfiniBand and Remote DMA (RDMA) Interfaces
Input Subsystem
Generic System Interconnect Subsystem
IPMB Driver for a Satellite MC
The Linux IPMI Driver
The Intel Silicon Security Engine Interface (Intel SSEI)
libATA Developer’s Guide
The Common Mailbox Framework
RAID
Media subsystem kernel internal API
Intel(R) Management Engine Interface (Intel(R) MEI)
Memory Controller drivers
Message-based devices
Miscellaneous Devices
Parallel Port Devices
16x50 UART Driver
Pulse-Width Modulation (PWM)
MMC/SD/SDIO card support
Memory Technology Device (MTD)
MTD NAND Driver Programming Interface
Near Field Communication
NTB Drivers
Non-Volatile Memory Device (NVDIMM)
NVMEM Subsystem
PARPORT interface documentation
Generic PHY Framework
PINCTRL (PIN CONTROL) subsystem
PLDM Firmware Flash Update Library
PPS - Pulse Per Second
PTP hardware clock infrastructure for Linux
Pulse Width Modulation (PWM) interface
Power Sequencing API
Voltage and current regulator API
Reset controller API
rfkill - RF kill switch support
Writing s390 channel device drivers
SCSI Interfaces Guide
Support for Serial devices
SM501 Driver
SoundWire Documentation
Serial Peripheral Interface (SPI)
Steal Governor
Introduction
Core idea
Workload considerations
Module Parameters
Reasons for CONFIG_STEAL_GOVERNOR=m
Surface System Aggregator Module (SSAM)
Linux Switchtec Support
Sync File API Guide
target and iSCSI Interfaces Guide
TEE (Trusted Execution Environment) driver API
Thermal
TTY
WBRF - Wifi Band RFI Mitigations
WMI Driver API
Xilinx FPGA
Writing Device Drivers for Zorro Devices