From: Bartosz Golaszewski <brgl@bgdev.pl>
To: Kent Gibson <warthog618@gmail.com>,
Linus Walleij <linus.walleij@linaro.org>
Cc: linux-gpio@vger.kernel.org, linux-kernel@vger.kernel.org,
Bartosz Golaszewski <bgolaszewski@baylibre.com>
Subject: [PATCH v2 00/11] gpiolib: add an ioctl() for monitoring line status changes
Date: Wed, 4 Dec 2019 16:59:03 +0100 [thread overview]
Message-ID: <20191204155912.17590-1-brgl@bgdev.pl> (raw)
From: Bartosz Golaszewski <bgolaszewski@baylibre.com>
When discussing the recent user-space changes with Kent and while working
on dbus API for libgpiod I noticed that we really don't have any way of
keeping the line info synchronized between the kernel and user-space
processes. We can of course periodically re-read the line information or
even do it every time we want to read a property but this isn't optimal.
This series adds a new ioctl() that allows user-space to set up a watch on
the GPIO chardev file-descriptor which can then be polled for events
emitted by the kernel when the line is requested, released or its status
changed. This of course doesn't require the line to be requested. Multiple
user-space processes can watch the same lines.
The first couple patches just fix some issues I noticed when implementing
the new interface. Patch 10/11 provides the actual ioctl() implementation
while patch 11/11 adds a simple user-space program to tools that can be
used to watch the line info changes.
v1: https://lkml.org/lkml/2019/11/27/327
v1 -> v2:
- rework the main patch of the series: re-use the existing file-descriptor
associated with an open character device
- add a patch adding a debug message when the line event kfifo is full and
we're discarding another event
- rework the locking mechanism for lineevent kfifo: reuse the spinlock
from the waitqueue structure
- other minor changes
Bartosz Golaszewski (11):
gpiolib: use 'unsigned int' instead of 'unsigned' in gpio_set_config()
gpiolib: have a single place of calling set_config()
gpiolib: convert the type of hwnum to unsigned int in
gpiochip_get_desc()
gpiolib: use gpiochip_get_desc() in linehandle_create()
gpiolib: use gpiochip_get_desc() in lineevent_create()
gpiolib: use gpiochip_get_desc() in gpio_ioctl()
gpiolib: rework the locking mechanism for lineevent kfifo
gpiolib: emit a debug message when adding events to a full kfifo
gpiolib: provide a dedicated function for setting lineinfo
gpiolib: add new ioctl() for monitoring changes in line info
tools: gpio: implement gpio-watch
drivers/gpio/gpiolib.c | 378 ++++++++++++++++++++++++++----------
drivers/gpio/gpiolib.h | 5 +-
include/linux/gpio/driver.h | 3 +-
include/uapi/linux/gpio.h | 24 +++
tools/gpio/.gitignore | 1 +
tools/gpio/Build | 1 +
tools/gpio/Makefile | 11 +-
tools/gpio/gpio-watch.c | 112 +++++++++++
8 files changed, 434 insertions(+), 101 deletions(-)
create mode 100644 tools/gpio/gpio-watch.c
--
2.23.0
next reply other threads:[~2019-12-04 15:59 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-04 15:59 Bartosz Golaszewski [this message]
2019-12-04 15:59 ` [PATCH v2 01/11] gpiolib: use 'unsigned int' instead of 'unsigned' in gpio_set_config() Bartosz Golaszewski
2019-12-04 22:18 ` Andy Shevchenko
2019-12-04 15:59 ` [PATCH v2 02/11] gpiolib: have a single place of calling set_config() Bartosz Golaszewski
2019-12-04 22:18 ` Andy Shevchenko
2019-12-04 15:59 ` [PATCH v2 03/11] gpiolib: convert the type of hwnum to unsigned int in gpiochip_get_desc() Bartosz Golaszewski
2019-12-04 22:19 ` Andy Shevchenko
2019-12-04 15:59 ` [PATCH v2 04/11] gpiolib: use gpiochip_get_desc() in linehandle_create() Bartosz Golaszewski
2019-12-04 22:20 ` Andy Shevchenko
2019-12-04 15:59 ` [PATCH v2 05/11] gpiolib: use gpiochip_get_desc() in lineevent_create() Bartosz Golaszewski
2019-12-04 22:20 ` Andy Shevchenko
2019-12-04 15:59 ` [PATCH v2 06/11] gpiolib: use gpiochip_get_desc() in gpio_ioctl() Bartosz Golaszewski
2019-12-04 16:25 ` Rainer Sickinger
2019-12-04 22:21 ` Andy Shevchenko
2019-12-04 15:59 ` [PATCH v2 07/11] gpiolib: rework the locking mechanism for lineevent kfifo Bartosz Golaszewski
2019-12-04 22:25 ` Andy Shevchenko
2019-12-05 9:31 ` Bartosz Golaszewski
2019-12-05 10:22 ` Andy Shevchenko
2019-12-04 15:59 ` [PATCH v2 08/11] gpiolib: emit a debug message when adding events to a full kfifo Bartosz Golaszewski
2019-12-04 22:28 ` Andy Shevchenko
2019-12-19 16:22 ` Bartosz Golaszewski
2019-12-04 15:59 ` [PATCH v2 09/11] gpiolib: provide a dedicated function for setting lineinfo Bartosz Golaszewski
2019-12-04 22:30 ` Andy Shevchenko
2019-12-05 9:28 ` Bartosz Golaszewski
2019-12-05 10:20 ` Andy Shevchenko
2019-12-05 13:45 ` Bartosz Golaszewski
2019-12-05 16:47 ` Andy Shevchenko
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