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* [PATCH v14 00/17] Introduce the Counter character device interface
@ 2021-08-03 12:06 William Breathitt Gray
  2021-08-03 12:06 ` [PATCH v14 01/17] counter: 104-quad-8: Return error when invalid mode during ceiling_write William Breathitt Gray
                   ` (16 more replies)
  0 siblings, 17 replies; 25+ messages in thread
From: William Breathitt Gray @ 2021-08-03 12:06 UTC (permalink / raw)
  To: jic23
  Cc: linux-stm32, kernel, a.fatoum, kamel.bouhara, gwendal,
	alexandre.belloni, david, linux-iio, linux-kernel,
	linux-arm-kernel, syednwaris, patrick.havelange, fabrice.gasnier,
	mcoquelin.stm32, alexandre.torgue, o.rempel, jarkko.nikula,
	William Breathitt Gray

Changes in v14:
 - Initialize counter_fops owner to THIS_MODULE
 - Implement ops_exist_lock to prevent counter->ops use during removal
 - Set counter->ops to NULL on counter_unregister to indicate removal;
   chrdev callbacks return -ENODEV if driver is removed
 - Refactor counter_fops read, poll, ioctl, and release callbacks to
   utilize ops_exist_lock where needed and to check counter->ops
 - Wake up sleeping chrdev read() on counter_unregister
 - Move chrdev_lock introduce to the "counter: Add character device
   interface" patch; this is a more appropriate place to introduce this
   lock because the chrdev code is intended from the get-go to only
   allow for a single open() at a time

For convenience, this patchset is also available on my personal git
repo: https://gitlab.com/vilhelmgray/iio/-/tree/counter_chrdev_v14

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 (17):
  counter: 104-quad-8: Return error when invalid mode during
    ceiling_write
  counter: Return error code on invalid modes
  counter: Standardize to ERANGE for limit exceeded errors
  counter: Rename counter_signal_value to counter_signal_level
  counter: Rename counter_count_function to counter_function
  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                  |  728 ++++----
 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                |  192 +++
 drivers/counter/counter-sysfs.c               |  962 +++++++++++
 drivers/counter/counter-sysfs.h               |   13 +
 drivers/counter/counter.c                     | 1496 -----------------
 drivers/counter/ftm-quaddec.c                 |   59 +-
 drivers/counter/intel-qep.c                   |  150 +-
 drivers/counter/interrupt-cnt.c               |   73 +-
 drivers/counter/microchip-tcb-capture.c       |  103 +-
 drivers/counter/stm32-lptimer-cnt.c           |  211 ++-
 drivers/counter/stm32-timer-cnt.c             |  147 +-
 drivers/counter/ti-eqep.c                     |  205 ++-
 include/linux/counter.h                       |  719 ++++----
 include/linux/counter_enum.h                  |   45 -
 include/uapi/linux/counter.h                  |  154 ++
 tools/Makefile                                |   13 +-
 tools/counter/Build                           |    1 +
 tools/counter/Makefile                        |   53 +
 tools/counter/counter_example.c               |   93 +
 27 files changed, 3623 insertions(+), 2768 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

-- 
2.32.0


^ permalink raw reply	[flat|nested] 25+ messages in thread

end of thread, other threads:[~2021-08-09  4:00 UTC | newest]

Thread overview: 25+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-08-03 12:06 [PATCH v14 00/17] Introduce the Counter character device interface William Breathitt Gray
2021-08-03 12:06 ` [PATCH v14 01/17] counter: 104-quad-8: Return error when invalid mode during ceiling_write William Breathitt Gray
2021-08-08 17:06   ` Jonathan Cameron
2021-08-03 12:06 ` [PATCH v14 02/17] counter: Return error code on invalid modes William Breathitt Gray
2021-08-08 17:07   ` Jonathan Cameron
2021-08-03 12:06 ` [PATCH v14 03/17] counter: Standardize to ERANGE for limit exceeded errors William Breathitt Gray
2021-08-08 17:08   ` Jonathan Cameron
2021-08-03 12:06 ` [PATCH v14 04/17] counter: Rename counter_signal_value to counter_signal_level William Breathitt Gray
2021-08-08 17:10   ` Jonathan Cameron
2021-08-03 12:06 ` [PATCH v14 05/17] counter: Rename counter_count_function to counter_function William Breathitt Gray
2021-08-08 17:15   ` Jonathan Cameron
2021-08-03 12:06 ` [PATCH v14 06/17] counter: Internalize sysfs interface code William Breathitt Gray
2021-08-08 17:23   ` Jonathan Cameron
2021-08-09  3:59     ` William Breathitt Gray
2021-08-03 12:06 ` [PATCH v14 07/17] counter: Update counter.h comments to reflect sysfs internalization William Breathitt Gray
2021-08-03 12:06 ` [PATCH v14 08/17] docs: counter: Update " William Breathitt Gray
2021-08-03 12:06 ` [PATCH v14 09/17] counter: Move counter enums to uapi header William Breathitt Gray
2021-08-03 12:06 ` [PATCH v14 10/17] counter: Add character device interface William Breathitt Gray
2021-08-03 12:06 ` [PATCH v14 11/17] docs: counter: Document " William Breathitt Gray
2021-08-03 12:06 ` [PATCH v14 12/17] tools/counter: Create Counter tools William Breathitt Gray
2021-08-03 12:06 ` [PATCH v14 13/17] counter: Implement signalZ_action_component_id sysfs attribute William Breathitt Gray
2021-08-03 12:06 ` [PATCH v14 14/17] counter: Implement *_component_id sysfs attributes William Breathitt Gray
2021-08-03 12:06 ` [PATCH v14 15/17] counter: Implement events_queue_size sysfs attribute William Breathitt Gray
2021-08-03 12:06 ` [PATCH v14 16/17] counter: 104-quad-8: Replace mutex with spinlock William Breathitt Gray
2021-08-03 12:06 ` [PATCH v14 17/17] counter: 104-quad-8: Add IRQ support for the ACCES 104-QUAD-8 William Breathitt Gray

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