linux.git/drivers/counter/interrupt-cnt.c, branch v6.8

counter: interrupt-cnt: Implement watch_validate callback

2022-09-30T12:32:35+00:00

The interrupt-cnt counter driver only pushes one type of event on only
one channel: COUNTER_EVENT_CHANGE_OF_STATE on channel 0. The
interrupt_cnt_watch_validate() watch_valid callback is implemented to
ensure watch configurations are valid for this driver.

Cc: Oleksij Rempel 
Cc: Pengutronix Kernel Team 
Link: https://lore.kernel.org/r/20220815225058.144203-1-william.gray@linaro.org/
Signed-off-by: William Breathitt Gray 
Link: https://lore.kernel.org/r/c50b5eede7d3f523de8dc3937dc44680f2773e1d.1664318353.git.william.gray@linaro.org
Signed-off-by: Greg Kroah-Hartman

counter: Move symbols into COUNTER namespace

2022-09-30T12:32:35+00:00

Counter subsystem symbols are only relevant to counter drivers. A
COUNTER namespace is created to control the availability of these
symbols to modules that import this namespace explicitly.

Cc: Patrick Havelange 
Cc: Jarkko Nikula 
Cc: Oleksij Rempel 
Cc: Pengutronix Kernel Team 
Cc: Kamel Bouhara 
Cc: Fabrice Gasnier 
Cc: Maxime Coquelin 
Cc: Alexandre Torgue 
Acked-by: David Lechner 
Reviewed-by: Jonathan Cameron 
Link: https://lore.kernel.org/r/20220815220321.74161-1-william.gray@linaro.org/
Signed-off-by: William Breathitt Gray 
Link: https://lore.kernel.org/r/8a756df96c24946547a7ece5caa5f654809c5e7f.1664318353.git.william.gray@linaro.org
Signed-off-by: Greg Kroah-Hartman

counter: interrupt-cnt: add counter_push_event()

2022-03-18T13:04:30+00:00

Add counter_push_event() to notify user space about new pulses

Link: https://lore.kernel.org/r/20220203135727.2374052-3-o.rempel@pengutronix.de
Signed-off-by: Oleksij Rempel 
Signed-off-by: William Breathitt Gray 
Link: https://lore.kernel.org/r/9da3460113b5092e8658e12f23578567aab7cc5f.1647373009.git.vilhelm.gray@gmail.com
Signed-off-by: Greg Kroah-Hartman

counter: interrupt-cnt: Convert to new counter registration

2021-12-30T16:44:07+00:00

This fixes device lifetime issues where it was possible to free a live
struct device.

Fixes: a55ebd47f21f ("counter: add IRQ or GPIO based counter")
Reviewed-by: Jonathan Cameron 
Acked-by: William Breathitt Gray 
Signed-off-by: Uwe Kleine-König 
Link: https://lore.kernel.org/r/20211230150300.72196-17-u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman

counter: interrupt-cnt: Convert to counter_priv() wrapper

2021-12-30T16:44:06+00:00

This is a straight forward conversion to the new counter_priv() wrapper.

Acked-by: Jonathan Cameron 
Acked-by: William Breathitt Gray 
Signed-off-by: Uwe Kleine-König 
Link: https://lore.kernel.org/r/20211230150300.72196-7-u.kleine-koenig@pengutronix.de
Signed-off-by: Greg Kroah-Hartman

counter: Internalize sysfs interface code

2021-10-17T09:52:58+00:00

This is a reimplementation of the Generic Counter driver interface.
There are no modifications to the Counter subsystem userspace interface,
so existing userspace applications should continue to run seamlessly.

The purpose of this patch is to internalize the sysfs interface code
among the various counter drivers into a shared module. Counter drivers
pass and take data natively (i.e. u8, u64, etc.) and the shared counter
module handles the translation between the sysfs interface and the
device drivers. This guarantees a standard userspace interface for all
counter drivers, and helps generalize the Generic Counter driver ABI in
order to support the Generic Counter chrdev interface (introduced in a
subsequent patch) without significant changes to the existing counter
drivers.

Note, Counter device registration is the same as before: drivers
populate a struct counter_device with components and callbacks, then
pass the structure to the devm_counter_register function. However,
what's different now is how the Counter subsystem code handles this
registration internally.

Whereas before callbacks would interact directly with sysfs data, this
interaction is now abstracted and instead callbacks interact with native
C data types. The counter_comp structure forms the basis for Counter
extensions.

The counter-sysfs.c file contains the code to parse through the
counter_device structure and register the requested components and
extensions. Attributes are created and populated based on type, with
respective translation functions to handle the mapping between sysfs and
the counter driver callbacks.

The translation performed for each attribute is straightforward: the
attribute type and data is parsed from the counter_attribute structure,
the respective counter driver read/write callback is called, and sysfs
I/O is handled before or after the driver read/write function is called.

Cc: Jarkko Nikula 
Cc: Patrick Havelange 
Cc: Kamel Bouhara 
Cc: Maxime Coquelin 
Cc: Alexandre Torgue 
Cc: Dan Carpenter 
Acked-by: Syed Nayyar Waris 
Reviewed-by: David Lechner 
Tested-by: David Lechner 
Signed-off-by: William Breathitt Gray 
Reviewed-by: Fabrice Gasnier  # for stm32
Link: https://lore.kernel.org/r/c68b4a1ffb195c1a2f65e8dd5ad7b7c14e79c6ef.1630031207.git.vilhelm.gray@gmail.com
Signed-off-by: Jonathan Cameron

counter: Rename counter_count_function to counter_function

2021-08-09T19:17:36+00:00

The phrase "Counter Count function" is verbose and unintentionally
implies that function is a Count extension. This patch adjusts the
Counter subsystem code to use the more direct "Counter function" phrase
to make the intent of this code clearer.

Cc: Jarkko Nikula 
Cc: Patrick Havelange 
Cc: Oleksij Rempel 
Cc: Kamel Bouhara 
Cc: Maxime Coquelin 
Cc: Alexandre Torgue 
Cc: David Lechner 
Acked-by: Syed Nayyar Waris 
Reviewed-by: Fabrice Gasnier 
Signed-off-by: William Breathitt Gray 
Link: https://lore.kernel.org/r/8268c54d6f42075a19bb08151a37831e22652499.1627990337.git.vilhelm.gray@gmail.com
Signed-off-by: Jonathan Cameron

counter: Rename counter_signal_value to counter_signal_level

2021-08-09T19:17:36+00:00

Signal values will always be levels so let's be explicit it about it to
make the intent of the code clear.

Cc: Oleksij Rempel 
Cc: Kamel Bouhara 
Acked-by: Syed Nayyar Waris 
Reviewed-by: David Lechner 
Signed-off-by: William Breathitt Gray 
Link: https://lore.kernel.org/r/3f17010abe2415859cea9a5fddabd3c97f635ff5.1627990337.git.vilhelm.gray@gmail.com
Signed-off-by: Jonathan Cameron

counter: Standardize to ERANGE for limit exceeded errors

2021-08-09T19:17:36+00:00

ERANGE is a semantically better error code to return when an argument
value falls outside the supported limit range of a device.

Cc: Jarkko Nikula 
Cc: Oleksij Rempel 
Cc: Maxime Coquelin 
Cc: Alexandre Torgue 
Acked-by: Syed Nayyar Waris 
Reviewed-by: David Lechner 
Reviewed-by: Fabrice Gasnier 
Signed-off-by: William Breathitt Gray 
Link: https://lore.kernel.org/r/ae8d3b20b8b02c96b1c9898ffa2f9fa5d99edc81.1627990337.git.vilhelm.gray@gmail.com
Signed-off-by: Jonathan Cameron

counter: interrupt-cnt: Add const qualifier for actions_list array

2021-06-13T16:00:18+00:00

The struct counter_synapse actions_list member expects a const enum
counter_synapse_action array. This patch renames
interrupt_cnt_synapse_actionss to interrupt_cnt_synapse_actions and adds
a const qualifier to match actions_list.

Cc: Oleksij Rempel 
Signed-off-by: William Breathitt Gray 
Reviewed-by: 
Link: https://lore.kernel.org/r/20210610013642.149961-1-vilhelm.gray@gmail.com
Signed-off-by: Jonathan Cameron