Commit 86b525be authored by Rodolfo Giometti's avatar Rodolfo Giometti Committed by Greg Kroah-Hartman
Browse files

drivers pps: add PPS generators support 



Sometimes one needs to be able not only to catch PPS signals but to
produce them also. For example, running a distributed simulation,
which requires computers' clock to be synchronized very tightly.

This patch adds PPS generators class in order to have a well-defined
interface for these devices.

Signed-off-by: default avatarRodolfo Giometti <giometti@enneenne.com>
Link: https://lore.kernel.org/r/20241108073115.759039-2-giometti@enneenne.com


Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent c79a39dc

Documentation/userspace-api/ioctl/ioctl-number.rst

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@@ -283,6 +283,7 @@ Code Seq# Include File Comments 
'p'   80-9F  linux/ppdev.h                                           user-space parport

                                                                     <mailto:tim@cyberelk.net>

'p'   A1-A5  linux/pps.h                                             LinuxPPS

'p'   B1-B3  linux/pps-gen.h                                         LinuxPPS

                                                                     <mailto:giometti@linux.it>

'q'   00-1F  linux/serio.h

'q'   80-FF  linux/telephony.h                                       Internet PhoneJACK, Internet LineJACK

MAINTAINERS

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@@ -18719,6 +18719,7 @@ F: Documentation/devicetree/bindings/pps/pps-gpio.yaml 
F:	Documentation/driver-api/pps.rst

F:	drivers/pps/

F:	include/linux/pps*.h

F:	include/uapi/linux/pps-gen.h

F:	include/uapi/linux/pps.h









PRESSURE STALL INFORMATION (PSI)

























drivers/pps/Makefile



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@@ -6,6 +6,7 @@







pps_core-y			:= pps.o kapi.o sysfs.o









pps_core-$(CONFIG_NTP_PPS)	+= kc.o









obj-$(CONFIG_PPS)		:= pps_core.o









obj-y				+= clients/ generators/









obj-y				+= clients/









obj-$(CONFIG_PPS_GENERATOR)	+= generators/



















ccflags-$(CONFIG_PPS_DEBUG) := -DDEBUG
























drivers/pps/generators/Kconfig



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# PPS generators configuration









#



















comment "PPS generators support"









menuconfig PPS_GENERATOR









	tristate "PPS generators support"









	help









	  PPS generators are special hardware which are able to produce PPS









	  (Pulse Per Second) signals.



















	  To compile this driver as a module, choose M here: the module









	  will be called pps_gen_core.



















if PPS_GENERATOR



















config PPS_GENERATOR_PARPORT









	tristate "Parallel port PPS signal generator"








@@ -12,3 +21,5 @@ config PPS_GENERATOR_PARPORT







	  If you say yes here you get support for a PPS signal generator which









	  utilizes STROBE pin of a parallel port to send PPS signals. It uses









	  parport abstraction layer and hrtimers to precisely control the signal.



















endif # PPS_GENERATOR
























drivers/pps/generators/Makefile



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# Makefile for PPS generators.









#



















pps_gen_core-y			:= pps_gen.o sysfs.o









obj-$(CONFIG_PPS_GENERATOR)	:= pps_gen_core.o



















obj-$(CONFIG_PPS_GENERATOR_PARPORT) += pps_gen_parport.o



















ccflags-$(CONFIG_PPS_DEBUG) := -DDEBUG