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Message-Id: <cover.1627990337.git.vilhelm.gray@gmail.com>
Date: Tue, 3 Aug 2021 21:06:10 +0900
From: William Breathitt Gray <vilhelm.gray@...il.com>
To: jic23@...nel.org
Cc: linux-stm32@...md-mailman.stormreply.com, kernel@...gutronix.de,
a.fatoum@...gutronix.de, kamel.bouhara@...tlin.com,
gwendal@...omium.org, alexandre.belloni@...tlin.com,
david@...hnology.com, linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
syednwaris@...il.com, patrick.havelange@...ensium.com,
fabrice.gasnier@...com, mcoquelin.stm32@...il.com,
alexandre.torgue@...com, o.rempel@...gutronix.de,
jarkko.nikula@...ux.intel.com,
William Breathitt Gray <vilhelm.gray@...il.com>
Subject: [PATCH v14 00/17] Introduce the Counter character device interface
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
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