[PATCH v16 00/14] Introduce the Counter character device interface

[William Breathitt Gray]

Changes in v16:
 - Define magic numbers for stm32-lptimer-cnt clock polarities
 - Define magic numbers for stm32-timer-cnt encoder modes
 - Bump KernelVersion to 5.16 in sysfs-bus-counter ABI documentation
 - Fix typos in driver API generic-counter.rst documentation file

For convenience, this patchset is also available on my personal git
repo: https://gitlab.com/vilhelmgray/iio/-/tree/counter_chrdev_v16

The patches preceding "counter: Internalize sysfs interface code" are
primarily cleanup and fixes that can be picked up and applied now to the
IIO tree if so desired. The "counter: Internalize sysfs interface code"
patch as well may be considered for pickup because it is relatively safe
and makes no changes to the userspace interface.

To summarize the main points of this patchset: there are no changes to
the existing Counter sysfs userspace interface; a Counter character
device interface is introduced that allows Counter events and associated
data to be read() by userspace; the events_configure() and
watch_validate() driver callbacks are introduced to support Counter
events; and IRQ support is added to the 104-QUAD-8 driver, serving as an
example of how to support the new Counter events functionality.

William Breathitt Gray (14):
  counter: stm32-lptimer-cnt: Provide defines for clock polarities
  counter: stm32-timer-cnt: Provide defines for slave mode selection
  counter: Internalize sysfs interface code
  counter: Update counter.h comments to reflect sysfs internalization
  docs: counter: Update to reflect sysfs internalization
  counter: Move counter enums to uapi header
  counter: Add character device interface
  docs: counter: Document character device interface
  tools/counter: Create Counter tools
  counter: Implement signalZ_action_component_id sysfs attribute
  counter: Implement *_component_id sysfs attributes
  counter: Implement events_queue_size sysfs attribute
  counter: 104-quad-8: Replace mutex with spinlock
  counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8

 Documentation/ABI/testing/sysfs-bus-counter   |   38 +-
 Documentation/driver-api/generic-counter.rst  |  358 +++-
 .../userspace-api/ioctl/ioctl-number.rst      |    1 +
 MAINTAINERS                                   |    3 +-
 drivers/counter/104-quad-8.c                  |  699 ++++----
 drivers/counter/Kconfig                       |    6 +-
 drivers/counter/Makefile                      |    1 +
 drivers/counter/counter-chrdev.c              |  553 ++++++
 drivers/counter/counter-chrdev.h              |   14 +
 drivers/counter/counter-core.c                |  191 +++
 drivers/counter/counter-sysfs.c               |  960 +++++++++++
 drivers/counter/counter-sysfs.h               |   13 +
 drivers/counter/counter.c                     | 1496 -----------------
 drivers/counter/ftm-quaddec.c                 |   60 +-
 drivers/counter/intel-qep.c                   |  144 +-
 drivers/counter/interrupt-cnt.c               |   62 +-
 drivers/counter/microchip-tcb-capture.c       |   91 +-
 drivers/counter/stm32-lptimer-cnt.c           |  212 ++-
 drivers/counter/stm32-timer-cnt.c             |  195 +--
 drivers/counter/ti-eqep.c                     |  180 +-
 include/linux/counter.h                       |  715 ++++----
 include/linux/counter_enum.h                  |   45 -
 include/linux/mfd/stm32-lptimer.h             |    5 +
 include/linux/mfd/stm32-timers.h              |    4 +
 include/uapi/linux/counter.h                  |  154 ++
 tools/Makefile                                |   13 +-
 tools/counter/Build                           |    1 +
 tools/counter/Makefile                        |   53 +
 tools/counter/counter_example.c               |   93 +
 29 files changed, 3569 insertions(+), 2791 deletions(-)
 create mode 100644 drivers/counter/counter-chrdev.c
 create mode 100644 drivers/counter/counter-chrdev.h
 create mode 100644 drivers/counter/counter-core.c
 create mode 100644 drivers/counter/counter-sysfs.c
 create mode 100644 drivers/counter/counter-sysfs.h
 delete mode 100644 drivers/counter/counter.c
 delete mode 100644 include/linux/counter_enum.h
 create mode 100644 include/uapi/linux/counter.h
 create mode 100644 tools/counter/Build
 create mode 100644 tools/counter/Makefile
 create mode 100644 tools/counter/counter_example.c


base-commit: 5ffeb17c0d3dd44704b4aee83e297ec07666e4d6
-- 
2.32.0