Commit Graph

15 Commits

Author SHA1 Message Date
William Breathitt Gray
7aa2ba0df6 counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8
The LSI/CSI LS7266R1 chip provides programmable output via the FLG pins.
When interrupts are enabled on the ACCES 104-QUAD-8, they occur whenever
FLG1 is active. Four functions are available for the FLG1 signal: Carry,
Compare, Carry-Borrow, and Index.

	Carry:
		Interrupt generated on active low Carry signal. Carry
		signal toggles every time the respective channel's
		counter overflows.

	Compare:
		Interrupt generated on active low Compare signal.
		Compare signal toggles every time respective channel's
		preset register is equal to the respective channel's
		counter.

	Carry-Borrow:
		Interrupt generated on active low Carry signal and
		active low Borrow signal. Carry signal toggles every
		time the respective channel's counter overflows. Borrow
		signal toggles every time the respective channel's
		counter underflows.

	Index:
		Interrupt generated on active high Index signal.

These four functions correspond respectivefly to the following four
Counter event types: COUNTER_EVENT_OVERFLOW, COUNTER_EVENT_THRESHOLD,
COUNTER_EVENT_OVERFLOW_UNDERFLOW, and COUNTER_EVENT_INDEX. Interrupts
push Counter events to event channel X, where 'X' is the respective
channel whose FLG1 activated.

This patch adds IRQ support for the ACCES 104-QUAD-8. The interrupt line
numbers for the devices may be configured via the irq array module
parameter.

Acked-by: Syed Nayyar Waris <syednwaris@gmail.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Link: https://lore.kernel.org/r/e3a28e100840e3a336fa93fce77445f0e9d9a674.1632884256.git.vilhelm.gray@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-10-17 10:55:55 +01:00
Jarkko Nikula
b711f687a1 counter: Add support for Intel Quadrature Encoder Peripheral
Add support for Intel Quadrature Encoder Peripheral found on Intel
Elkhart Lake platform.

Initial implementation was done by Felipe Balbi while he was working at
Intel with later changes from Raymond Tan and me.

Co-developed-by: Felipe Balbi (Intel) <balbi@kernel.org>
Signed-off-by: Felipe Balbi (Intel) <balbi@kernel.org>
Co-developed-by: Raymond Tan <raymond.tan@intel.com>
Signed-off-by: Raymond Tan <raymond.tan@intel.com>
Signed-off-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Link: https://lore.kernel.org/r/20210602113259.158674-1-jarkko.nikula@linux.intel.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-06-03 18:24:14 +01:00
Oleksij Rempel
a55ebd47f2 counter: add IRQ or GPIO based counter
Add simple IRQ or GPIO base counter. This device is used to measure
rotation speed of some agricultural devices, so no high frequency on the
counter pin is expected.

The maximal measurement frequency depends on the CPU and system load. On
the idle iMX6S I was able to measure up to 20kHz without count drops.

Signed-off-by: Oleksij Rempel <o.rempel@pengutronix.de>
Reviewed-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Reviewed-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Link: https://lore.kernel.org/r/20210301080401.22190-3-o.rempel@pengutronix.de
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-03-25 19:13:51 +00:00
William Breathitt Gray
e357e81fcf counter: 104-quad-8: Remove IIO counter ABI
The IIO counter driver has been superseded by the Counter subsystem as
discussed in [1]. This patch removes the IIO counter ABI from the
104-QUAD-8 driver.

[1] https://lore.kernel.org/lkml/20210119104105.000010df@Huawei.com/

Cc: Syed Nayyar Waris <syednwaris@gmail.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Link: https://lore.kernel.org/r/98a39983d5df761c058a469d1346fd8ffdef8516.1611973018.git.vilhelm.gray@gmail.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-03-11 20:46:56 +00:00
Fabrice Gasnier
01f68f067d counter: stm32-lptimer-cnt: remove iio counter abi
Currently, the STM32 LP Timer counter driver registers into both IIO and
counter subsystems, which is redundant.

Remove the IIO counter ABI and IIO registration from the STM32 LP Timer
counter driver since it's been superseded by the Counter subsystem
as discussed in [1].

Keep only the counter subsystem related part.
Move a part of the ABI documentation into a driver comment.

This also removes a duplicate ABI warning
$ scripts/get_abi.pl validate
...
/sys/bus/iio/devices/iio:deviceX/in_count0_preset is defined 2 times:
  ./Documentation/ABI/testing/sysfs-bus-iio-timer-stm32:100
  ./Documentation/ABI/testing/sysfs-bus-iio-lptimer-stm32:0

[1] https://lkml.org/lkml/2021/1/19/347

Acked-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/1611926542-2490-1-git-send-email-fabrice.gasnier@foss.st.com
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2021-03-11 20:46:56 +00:00
Kamel Bouhara
106b104137 counter: Add microchip TCB capture counter
This drivers allows to use the capture mode of the Timer Counter Block
hardware block available in Microchip SoCs through the counter subsystem.

Two functions of the counter are supported for the moment: period
capture and quadrature decoder. The latter is only supported by the
SAMA5 series of SoCs.

For the period capture mode a basic setup has been chosen that will
reset the counter each time the period is actually reached. Of course
the device offers much more possibilities.

For quadrature mode, both channel 0 and 1 must be configured even if we
only capture the position (no revolution/rotation).

Signed-off-by: Kamel Bouhara <kamel.bouhara@bootlin.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2020-07-20 13:04:40 +01:00
David Lechner
f213729f67 counter: new TI eQEP driver
This adds a new counter driver for the Texas Instruments Enhanced
Quadrature Encoder Pulse (eQEP) module.

Only very basic functionality is currently implemented - only enough to
be able to read the position. The actual device has many more features
which can be added to the driver on an as-needed basis.

It is not possible to read the QEPA/B signal values in hardware, so
that feature is omitted.

The TI_PWMSS kernel option is selected in Kconfig to enable the parent
bus, which is needed for power management.

Signed-off-by: David Lechner <david@lechnology.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2019-10-17 21:53:49 +01:00
Greg Kroah-Hartman
d7a5417b89 Second set of IIO fixes for the 5.2 cycle.
* ad7150
   - sense of bit for controlling adaptive vs fixed threshold was flipped.
 * adt7316
   - Fix a build issue due to wrong headers for gpio usage.
 * lsm6dsx
   - correctly suspend / resume i2c slaves when the host goes to sleep.
 * mlx90632
   - relax a compatability check to allow for newer devices.
 
 Also one counters fix
 
 * counter/ftm-quaddec
   - missing dependencies in Kconfig.
 -----BEGIN PGP SIGNATURE-----
 
 iQJFBAABCAAvFiEEbilms4eEBlKRJoGxVIU0mcT0FogFAl0H5PURHGppYzIzQGtl
 cm5lbC5vcmcACgkQVIU0mcT0Foh7bhAAqF/VG9KhIioY4ov5U+Exh5OGzirhTLKC
 TyuK4fnSHO9avql1lTAc9b/tt2tBdE4f0vel6CSP+1GlbwfG01AYUu+ZW7j/GkgT
 D09o4IH1TspqH5nIc2JunZwYqPJG2v7Fis9IMtS13eTJ+csf9EhVCuIf8tnaPwyM
 /OH7t3JdSqxtsxHECEsZhl5IDrqZKyQI3+7MtlpcnuQpNjrrwxey4B54csZamUH8
 nhefM7CtI+roaT+Ydp5oNpvpVXhNH54rVKwEkJfeuhiuviHoO7SgUF59u4vp9JYa
 5dVo+T8+b2gsAt1w4jDCNDALTrFYL1d4XCyHuW+ZvpTGfb99E0g2QRStuBJp0Nyn
 9s9K05KTdcHi3HBUxx+pKh7MDUBzKSm5T5euq4ZHRUKF3vjfBhsoN4iVh31IHa53
 Nv28vnnxUd7RXHZonoi9wIT0zoDSY1IvpNGtwJaOjBJNcUjtDQivV2KqqvvvSfj0
 g7KswaUB5icRR/mtL4Jj2j0voD2e+mMXgknRmHJthXKBKzs4lQHFPqI1rZQy8DRg
 2YCi5zJNPBmf7hNbMqyt5YEkflZST3zzOUBRxdju4w3lwKZl6+bQd5B82ET6DZSr
 n99WXsGcdck/JEWomUhGb5uTbS2LAgsVLIXJTDzgzwQqE4Vp7FFYIHDNeTJx43Cm
 bEvNn0cT6a8=
 =2i3G
 -----END PGP SIGNATURE-----

Merge tag 'iio-fixes-for-5.2b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio into staging-linus

Jonathan writes:

Second set of IIO fixes for the 5.2 cycle.

* ad7150
  - sense of bit for controlling adaptive vs fixed threshold was flipped.
* adt7316
  - Fix a build issue due to wrong headers for gpio usage.
* lsm6dsx
  - correctly suspend / resume i2c slaves when the host goes to sleep.
* mlx90632
  - relax a compatability check to allow for newer devices.

Also one counters fix

* counter/ftm-quaddec
  - missing dependencies in Kconfig.

* tag 'iio-fixes-for-5.2b' of git://git.kernel.org/pub/scm/linux/kernel/git/jic23/iio:
  counter/ftm-quaddec: Add missing dependencies in Kconfig
  staging: iio: adt7316: Fix build errors when GPIOLIB is not set
  iio: temperature: mlx90632 Relax the compatibility check
  iio: imu: st_lsm6dsx: fix PM support for st_lsm6dsx i2c controller
  staging:iio:ad7150: fix threshold mode config bit
2019-06-17 22:28:29 +02:00
Patrick Havelange
0c75376fa3 counter/ftm-quaddec: Add missing dependencies in Kconfig
This driver uses devm_ioremap and of* functions. This fixes a
linking failure with e.g. ARCH=um.

Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Patrick Havelange <patrick.havelange@essensium.com>
Fixes: a3b9a99 ("counter: add FlexTimer Module Quadrature decoder counter driver")
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
2019-06-08 13:07:41 +01:00
Thomas Gleixner
ec8f24b7fa treewide: Add SPDX license identifier - Makefile/Kconfig
Add SPDX license identifiers to all Make/Kconfig files which:

 - Have no license information of any form

These files fall under the project license, GPL v2 only. The resulting SPDX
license identifier is:

  GPL-2.0-only

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-05-21 10:50:46 +02:00
Patrick Havelange
a3b9a99980 counter: add FlexTimer Module Quadrature decoder counter driver
This driver exposes the counter for the quadrature decoder of the
FlexTimer Module, present in the LS1021A soc.

Signed-off-by: Patrick Havelange <patrick.havelange@essensium.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-25 21:33:41 +02:00
Fabrice Gasnier
597f55e3f3 counter: stm32-lptimer: add counter device
Add support for new counter device to stm32-lptimer.

Signed-off-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-25 21:33:41 +02:00
Benjamin Gaignard
ad29937e20 counter: Add STM32 Timer quadrature encoder
Implement counter part of the STM32 timer hardware block by using
counter API. Hardware only supports X2 and X4 quadrature modes. A
ceiling value can be set to define the maximum value reachable by the
counter.

Signed-off-by: Benjamin Gaignard <benjamin.gaignard@st.com>
Co-authored-by: Fabrice Gasnier <fabrice.gasnier@st.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-25 21:33:39 +02:00
William Breathitt Gray
f1d8a071d4 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: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-25 21:33:38 +02:00
William Breathitt Gray
0040a390d2 counter: Introduce the Generic Counter interface
This patch introduces the Generic Counter interface for supporting
counter devices.

In the context of the Generic Counter interface, a counter is defined as
a device that reports one or more "counts" based on the state changes of
one or more "signals" as evaluated by a defined "count function."

Driver callbacks should be provided to communicate with the device: to
read and write various Signals and Counts, and to set and get the
"action mode" and "count function" for various Synapses and Counts
respectively.

To support a counter device, a driver must first allocate the available
Counter Signals via counter_signal structures. These Signals should
be stored as an array and set to the signals array member of an
allocated counter_device structure before the Counter is registered to
the system.

Counter Counts may be allocated via counter_count structures, and
respective Counter Signal associations (Synapses) made via
counter_synapse structures. Associated counter_synapse structures are
stored as an array and set to the the synapses array member of the
respective counter_count structure. These counter_count structures are
set to the counts array member of an allocated counter_device structure
before the Counter is registered to the system.

A counter device is registered to the system by passing the respective
initialized counter_device structure to the counter_register function;
similarly, the counter_unregister function unregisters the respective
Counter. The devm_counter_register and devm_counter_unregister functions
serve as device memory-managed versions of the counter_register and
counter_unregister functions respectively.

Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-04-25 21:33:37 +02:00