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Commit f1d8a071 authored by William Breathitt Gray's avatar William Breathitt Gray Committed by Greg Kroah-Hartman
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counter: 104-quad-8: Add Generic Counter interface support 



This patch adds support for the Generic Counter interface to the
104-QUAD-8 driver. The existing 104-QUAD-8 device interface should not
be affected by this patch; all changes are intended as supplemental
additions as perceived by the user.

Generic Counter Counts are created for the eight quadrature channel
counts, as well as their respective quadrature A and B Signals (which
are associated via respective Synapse structures) and respective index
Signals.

The new Generic Counter interface sysfs attributes are intended to
expose the same functionality and data available via the existing
104-QUAD-8 IIO device interface; the Generic Counter interface serves
to provide the respective functionality and data in a standard way
expected of counter devices.

Reviewed-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: default avatarWilliam Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent e854bac9

MAINTAINERS

+2 −2
Original line number Diff line number Diff line
@@ -268,12 +268,12 @@ L: linux-gpio@vger.kernel.org 
S:	Maintained

F:	drivers/gpio/gpio-104-idio-16.c



ACCES 104-QUAD-8 IIO DRIVER

ACCES 104-QUAD-8 DRIVER

M:	William Breathitt Gray <vilhelm.gray@gmail.com>

L:	linux-iio@vger.kernel.org

S:	Maintained

F:	Documentation/ABI/testing/sysfs-bus-iio-counter-104-quad-8

F:	drivers/iio/counter/104-quad-8.c

F:	drivers/counter/104-quad-8.c



ACCES PCI-IDIO-16 GPIO DRIVER

M:	William Breathitt Gray <vilhelm.gray@gmail.com>

drivers/iio/counter/104-quad-8.c→drivers/counter/104-quad-8.c

+1367 −0

File changed and moved.

Preview size limit exceeded, changes collapsed.

drivers/counter/Kconfig

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@@ -8,3 +8,24 @@ menuconfig COUNTER 
	  This enables counter device support through the Generic Counter

	  interface. You only need to enable this, if you also want to enable

	  one or more of the counter device drivers below.



if COUNTER



config 104_QUAD_8

	tristate "ACCES 104-QUAD-8 driver"

	depends on PC104 && X86 && IIO

	select ISA_BUS_API

	help

	  Say yes here to build support for the ACCES 104-QUAD-8 quadrature

	  encoder counter/interface device family (104-QUAD-8, 104-QUAD-4).



	  A counter's respective error flag may be cleared by performing a write

	  operation on the respective count value attribute. Although the

	  104-QUAD-8 counters have a 25-bit range, only the lower 24 bits may be

	  set, either directly or via the counter's preset attribute. Interrupts

	  are not supported by this driver.



	  The base port addresses for the devices may be configured via the base

	  array module parameter.



endif # COUNTER

drivers/counter/Makefile

+2 −0
Original line number Diff line number Diff line
@@ -3,3 +3,5 @@ 
#



obj-$(CONFIG_COUNTER) += counter.o



obj-$(CONFIG_104_QUAD_8)	+= 104-quad-8.o

drivers/iio/counter/Kconfig

+0 −17
Original line number Diff line number Diff line
@@ -5,23 +5,6 @@ 


menu "Counters"



config 104_QUAD_8

	tristate "ACCES 104-QUAD-8 driver"

	depends on PC104 && X86

	select ISA_BUS_API

	help

	  Say yes here to build support for the ACCES 104-QUAD-8 quadrature

	  encoder counter/interface device family (104-QUAD-8, 104-QUAD-4).



	  Performing a write to a counter's IIO_CHAN_INFO_RAW sets the counter and

	  also clears the counter's respective error flag. Although the counters

	  have a 25-bit range, only the lower 24 bits may be set, either directly

	  or via a counter's preset attribute. Interrupts are not supported by

	  this driver.



	  The base port addresses for the devices may be configured via the base

	  array module parameter.



config STM32_LPTIMER_CNT

	tristate "STM32 LP Timer encoder counter driver"

	depends on MFD_STM32_LPTIMER || COMPILE_TEST