1. Driver Basics

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1. Driver Basics

Driver Entry and Exit points

module_init
— driver initialization entry point
module_exit
— driver exit entry point
Atomic and pointer manipulation

atomic_read
— read atomic variable
atomic_set
— set atomic variable
atomic_add
— add integer to atomic variable
atomic_sub
— subtract the atomic variable
atomic_sub_and_test
— subtract value from variable and test result
atomic_inc
— increment atomic variable
atomic_dec
— decrement atomic variable
atomic_dec_and_test
— decrement and test
atomic_inc_and_test
— increment and test
atomic_add_negative
— add and test if negative
atomic_add_return
— add and return
atomic_add_unless
— add unless the number is a given value
get_unaligned
— get value from possibly mis-aligned location
put_unaligned
— put value to a possibly mis-aligned location
Delaying, scheduling, and timer routines

pid_alive
— check that a task structure is not stale
is_init
— check if a task structure is init
__wake_up
— wake up threads blocked on a waitqueue.
__wake_up_sync
— wake up threads blocked on a waitqueue.
task_nice
— return the nice value of a given task.
sched_setscheduler
— change the scheduling policy and/or RT priority of
yield
— yield the current processor to other threads.
__round_jiffies
— function to round jiffies to a full second
__round_jiffies_relative
— function to round jiffies to a full second
round_jiffies
— function to round jiffies to a full second
round_jiffies_relative
— function to round jiffies to a full second
init_timer
— initialize a timer.
mod_timer
— modify a timer's timeout
del_timer
— deactive a timer.
del_timer_sync
— deactivate a timer and wait for the handler to finish.
getnstimeofday
— Returns the time of day in a timespec
do_gettimeofday
— Returns the time of day in a timeval
do_settimeofday
— Sets the time of day
schedule_timeout
— sleep until timeout
msleep
— sleep safely even with waitqueue interruptions
msleep_interruptible
— sleep waiting for signals
High-resolution timers

ktime_set
— Set a ktime_t variable from a seconds/nanoseconds value
ktime_sub
— subtract two ktime_t variables
ktime_add
— add two ktime_t variables
ktime_add_ns
— Add a scalar nanoseconds value to a ktime_t variable
timespec_to_ktime
— convert a timespec to ktime_t format
timeval_to_ktime
— convert a timeval to ktime_t format
ktime_to_timespec
— convert a ktime_t variable to timespec format
ktime_to_timeval
— convert a ktime_t variable to timeval format
ktime_to_ns
— convert a ktime_t variable to scalar nanoseconds
struct hrtimer
— the basic hrtimer structure
struct hrtimer_sleeper
— simple sleeper structure
struct hrtimer_base
— the timer base for a specific clock
ktime_get_real
— get the real (wall-) time in ktime_t format
ktime_get_ts
— get the monotonic clock in timespec format
hrtimer_start
— (re)start an relative timer on the current CPU
hrtimer_try_to_cancel
— try to deactivate a timer
hrtimer_cancel
— cancel a timer and wait for the handler to finish.
hrtimer_get_remaining
— get remaining time for the timer
hrtimer_init
— initialize a timer to the given clock
hrtimer_get_res
— get the timer resolution for a clock
Workqueues and Kevents

run_scheduled_work
— run scheduled work synchronously
queue_work
— queue work on a workqueue
queue_delayed_work
— queue work on a workqueue after delay
queue_delayed_work_on
— queue work on specific CPU after delay
flush_workqueue
— ensure that any scheduled work has run to completion.
destroy_workqueue
— safely terminate a workqueue
schedule_work
— put work task in global workqueue
schedule_delayed_work
— put work task in global workqueue after delay
schedule_delayed_work_on
— queue work in global workqueue on CPU after delay
cancel_rearming_delayed_workqueue
— reliably kill off a delayed
cancel_rearming_delayed_work
— reliably kill off a delayed keventd
execute_in_process_context
— reliably execute the routine with user context
Internal Functions

reparent_to_init
— Reparent the calling kernel thread to the init task
sys_tgkill
— send signal to one specific thread
kthread_run
— create and wake a thread.
kthread_should_stop
— should this kthread return now?
kthread_create
— create a kthread.
kthread_bind
— bind a just-created kthread to a cpu.
kthread_stop
— stop a thread created by kthread_create.
Kernel objects manipulation

kobject_get_path
— generate and return the path associated with a given kobj
kobject_init
— initialize object.
kobject_add
— add an object to the hierarchy.
kobject_register
— initialize and add an object.
kobject_set_name
— Set the name of an object
kobject_del
— unlink kobject from hierarchy.
kobject_unregister
— remove object from hierarchy and decrement refcount.
kobject_get
— increment refcount for object.
kobject_put
— decrement refcount for object.
kset_register
— initialize and add a kset.
kset_unregister
— remove a kset.
subsystem_register
— register a subsystem.
subsys_create_file
— export sysfs attribute file.
Kernel utility functions

container_of
— cast a member of a structure out to the containing structure
printk
— print a kernel message
acquire_console_sem
— lock the console system for exclusive use.
release_console_sem
— unlock the console system
console_conditional_schedule
— yield the CPU if required
printk_timed_ratelimit
— caller-controlled printk ratelimiting
panic
— halt the system
atomic_notifier_chain_register
— Add notifier to an atomic notifier chain
atomic_notifier_chain_unregister
— Remove notifier from an atomic notifier chain
atomic_notifier_call_chain
— Call functions in an atomic notifier chain
blocking_notifier_chain_register
— Add notifier to a blocking notifier chain
blocking_notifier_chain_unregister
— Remove notifier from a blocking notifier chain
blocking_notifier_call_chain
— Call functions in a blocking notifier chain
raw_notifier_chain_register
— Add notifier to a raw notifier chain
raw_notifier_chain_unregister
— Remove notifier from a raw notifier chain
raw_notifier_call_chain
— Call functions in a raw notifier chain
srcu_notifier_chain_register
— Add notifier to an SRCU notifier chain
srcu_notifier_chain_unregister
— Remove notifier from an SRCU notifier chain
srcu_notifier_call_chain
— Call functions in an SRCU notifier chain
srcu_init_notifier_head
— Initialize an SRCU notifier head
register_reboot_notifier
— Register function to be called at reboot time
unregister_reboot_notifier
— Unregister previously registered reboot notifier
emergency_restart
— reboot the system
kernel_restart
— reboot the system
kernel_halt
— halt the system
kernel_power_off
— power_off the system
call_rcu
— Queue an RCU callback for invocation after a grace period.
call_rcu_bh
— Queue an RCU for invocation after a quicker grace period.
rcu_barrier
— Wait until all the in-flight RCUs are complete.
synchronize_rcu
— wait until a grace period has elapsed.




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Chapter 1. Driver Basics


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