JIRA: https://issues.redhat.com/browse/RHEL-26354
commit 36aa129f221c9070afd8dff03154ab49702a5b1b
Author: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Date: Wed Sep 27 16:29:21 2023 +0200
gpiolib: make gpio_device_get() and gpio_device_put() public
In order to start migrating away from accessing struct gpio_chip by
users other than their owners, let's first make the reference management
functions for the opaque struct gpio_device public in the driver.h
header.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: David Arcari <darcari@redhat.com>
JIRA: https://issues.redhat.com/browse/RHEL-946
commit 9ce4ed5b4db13633f9934a4eac02c4cde04d5c63
Author: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Date: Mon Aug 21 16:18:27 2023 +0200
gpiolib: provide and use gpiod_line_state_notify()
Wrap the calls to blocking_notifier_call_chain() for the line state
notifier with a helper that allows us to use fewer lines of code and
simpler syntax.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Izabela Bakollari <ibakolla@redhat.com>
JIRA: https://issues.redhat.com/browse/RHEL-946
commit a067419ba77da830939852758702388f0fba09a1
Author: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Date: Thu Aug 17 13:59:05 2023 +0200
gpiolib: add a second blocking notifier to struct gpio_device
Add a new blocking notifier to struct gpio_device and use it to notify
subscribers about the GPIO device being unregistered from the device
model.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Izabela Bakollari <ibakolla@redhat.com>
JIRA: https://issues.redhat.com/browse/RHEL-946
commit 17a7ca35890b411414a71fbeef13cb65fe9511df
Author: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Date: Thu Aug 17 10:52:28 2023 +0200
gpiolib: rename the gpio_device notifier
Change the generic "notifier" name to "line_state_notifier" in order to
reflect its purpose in preparation for adding a second notifier which
will be used to notify wait queues about device unregistering.
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Izabela Bakollari <ibakolla@redhat.com>
JIRA: https://issues.redhat.com/browse/RHEL-946
After adding the missing notifier.h header, let's order all includes
alphabetically.
Suggested-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
(cherry picked from commit 0f93a345aa42c40e2145c3719d878e7daa4eb6ee)
Signed-off-by: Izabela Bakollari <ibakolla@redhat.com>
JIRA: https://issues.redhat.com/browse/RHEL-946
bgpio_init() uses "sz" argument to populate ngpio, which is not
accurate. Instead, read the "ngpios" property from the DT and if it
doesn't exist, use the "sz" argument. With this change, drivers no
longer need to overwrite the ngpio variable after calling bgpio_init().
If the "ngpios" property is specified, bgpio_bits is calculated
as the round up value of ngpio. At the moment, the only requirement
specified is that the round up value must be a multiple of 8 but
it should also be a power of 2 because we provide accessors based
on the bank size in bgpio_setup_accessors().
Signed-off-by: Asmaa Mnebhi <asmaa@nvidia.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
(cherry picked from commit 55b2395e4e92adc492c6b30ac109eb78250dcd9d)
Signed-off-by: Izabela Bakollari <ibakolla@redhat.com>
Bugzilla: https://bugzilla.redhat.com/2183344
commit bdbbae241a04f387ba910b8609f95fad5f1470c7
Author: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Date: Mon Dec 5 13:39:03 2022 +0100
gpiolib: protect the GPIO device against being dropped while in use by user-space
While any of the GPIO cdev syscalls is in progress, the kernel can call
gpiochip_remove() (for instance, when a USB GPIO expander is disconnected)
which will set gdev->chip to NULL after which any subsequent access will
cause a crash.
To avoid that: use an RW-semaphore in which the syscalls take it for
reading (so that we don't needlessly prohibit the user-space from calling
syscalls simultaneously) while gpiochip_remove() takes it for writing so
that it can only happen once all syscalls return.
Fixes: d7c51b47ac ("gpio: userspace ABI for reading/writing GPIO lines")
Fixes: 3c0d9c635a ("gpiolib: cdev: support GPIO_V2_GET_LINE_IOCTL and GPIO_V2_LINE_GET_VALUES_IOCTL")
Fixes: aad955842d ("gpiolib: cdev: support GPIO_V2_GET_LINEINFO_IOCTL and GPIO_V2_GET_LINEINFO_WATCH_IOCTL")
Fixes: a54756cb24 ("gpiolib: cdev: support GPIO_V2_LINE_SET_CONFIG_IOCTL")
Fixes: 7b8e00d981 ("gpiolib: cdev: support GPIO_V2_LINE_SET_VALUES_IOCTL")
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
[Nick: fixed a build failure with CDEV_V1 disabled]
Co-authored-by: Nick Hainke <vincent@systemli.org>
Reviewed-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Shaoqin Huang <shahuang@redhat.com>
Bugzilla: https://bugzilla.redhat.com/2183344
commit 3b7c7478eda00945987d45f902bc3942c89243d3
Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Mon Nov 28 21:00:54 2022 +0200
gpiolib: Provide to_gpio_device() helper
Provide to_gpio_device() helper which can be utilized in the existing
and future code.
While at it, make sure it becomes no-op at compilation time.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Shaoqin Huang <shahuang@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2071835
Tested: This is one of a series of patch sets to enable Arm SystemReady IR
support in the kernel for NXP i.MX8 platforms. This set updates GPIO
support. It has been tested via simple boot tests and by using the
kernel GPIO tools to verify pins are being identified and can be used.
commit 42112dd77b74220e6a1f4a71bb51ca3f583d3842
Author: Dipen Patel <dipenp@nvidia.com>
Date: Fri Apr 22 13:52:16 2022 -0700
gpiolib: Add HTE support
Some GPIO chip can provide hardware timestamp support on its GPIO lines
, in order to support that, additional API needs to be added which
can talk to both GPIO chip and HTE (hardware timestamping engine)
providers if there is any dependencies. This patch introduces optional
hooks to enable and disable hardware timestamping related features
in the GPIO controller chip.
Signed-off-by: Dipen Patel <dipenp@nvidia.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Thierry Reding <treding@nvidia.com>
(cherry picked from commit 42112dd77b74220e6a1f4a71bb51ca3f583d3842)
Signed-off-by: Al Stone <ahs3@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2071835
Tested: This is one of a series of patch sets to enable Arm SystemReady IR
support in the kernel for NXP i.MX8 platforms. This set updates GPIO
support. It has been tested via simple boot tests and by using the
kernel GPIO tools to verify pins are being identified and can be used.
commit 66f46e370a9aec05524cdffde4062953e6ba2e08
Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Fri Apr 8 21:18:51 2022 +0300
gpiolib: Split out for_each_gpio_desc() macro
In some cases we want to traverse all GPIO descriptors for given
chip, let's split out for_each_gpio_desc() macro for such cases.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
(cherry picked from commit 66f46e370a9aec05524cdffde4062953e6ba2e08)
Signed-off-by: Al Stone <ahs3@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2071835
Tested: This is one of a series of patch sets to enable Arm SystemReady IR
support in the kernel for NXP i.MX8 platforms. This set updates GPIO
support. It has been tested via simple boot tests and by using the
kernel GPIO tools to verify pins are being identified and can be used.
commit 57017edd46f835c85642fe8299f13b0db61d4c31
Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Fri Apr 8 21:18:50 2022 +0300
gpiolib: Embed iterator variable into for_each_gpio_desc_with_flag()
The iterator loop is used exclusively to get a descriptor, which in its
turn is what is being used by the caller. Embed the iterator variable
into the loop in the for_each_gpio_desc_with_flag() macro helper.
Suggested-by: Bartosz Golaszewski <brgl@bgdev.pl>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
(cherry picked from commit 57017edd46f835c85642fe8299f13b0db61d4c31)
Signed-off-by: Al Stone <ahs3@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2071835
Tested: This is one of a series of patch sets to enable Arm SystemReady IR
support in the kernel for NXP i.MX8 platforms. This set updates GPIO
support. It has been tested via simple boot tests and by using the
kernel GPIO tools to verify pins are being identified and can be used.
commit 4398693a9e24bcab0b99ea219073917991d0792b
Author: Bartosz Golaszewski <brgl@bgdev.pl>
Date: Tue Feb 8 11:48:31 2022 +0100
gpiolib: make struct comments into real kernel docs
We have several comments that start with '/**' but don't conform to the
kernel doc standard. Add proper detailed descriptions for the affected
definitions and move the docs from the forward declarations to the
struct definitions where applicable.
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Randy Dunlap <rdunlap@infradead.org>
(cherry picked from commit 4398693a9e24bcab0b99ea219073917991d0792b)
Signed-off-by: Al Stone <ahs3@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2071835
Tested: This is one of a series of patch sets to enable Arm SystemReady IR
support in the kernel for NXP i.MX8 platforms. This set updates GPIO
support. It has been tested via simple boot tests and by using the
kernel GPIO tools to verify pins are being identified and can be used.
commit 80c78fbeef10121a0fbba3fd2ed333f5de118f6d
Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Tue Feb 1 17:27:56 2022 +0200
gpiolib: Introduce for_each_gpio_desc_with_flag() macro
In a few places we are using a loop against all GPIO descriptors
with a given flag for a given device. Replace it with a consolidated
for_each type of macro.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
(cherry picked from commit 80c78fbeef10121a0fbba3fd2ed333f5de118f6d)
Signed-off-by: Al Stone <ahs3@redhat.com>
Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2071835
Tested: This is one of a series of patch sets to enable Arm SystemReady IR
support in the kernel for NXP i.MX8 platforms. This set updates GPIO
support. It has been tested via simple boot tests and by using the
kernel GPIO tools to verify pins are being identified and can be used.
commit 95a4eed7dd5b7c1c3664a626174290686ddbee9f
Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Date: Tue Feb 1 17:27:55 2022 +0200
gpiolib: Never return internal error codes to user space
Currently it's possible that character device interface may return
the error codes which are not supposed to be seen by user space.
In this case it's EPROBE_DEFER.
Wrap it to return -ENODEV instead as sysfs does.
Fixes: d7c51b47ac ("gpio: userspace ABI for reading/writing GPIO lines")
Fixes: 61f922db72 ("gpio: userspace ABI for reading GPIO line events")
Fixes: 3c0d9c635a ("gpiolib: cdev: support GPIO_V2_GET_LINE_IOCTL and GPIO_V2_LINE_GET_VALUES_IOCTL")
Reported-by: Suresh Balakrishnan <suresh.balakrishnan@intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
(cherry picked from commit 95a4eed7dd5b7c1c3664a626174290686ddbee9f)
Signed-off-by: Al Stone <ahs3@redhat.com>
- several refactoring patches of the core gpiolib code
- add support for NXP PCAL9554B/C to gpio-pca953x
- allow probing mockup devices from device tree
- refactoring and improvements to gpio-rcar
- improvements to locking in gpio-tegra
- code shrink in gpiolib devres
- get the irq offset from device tree in gpio-sifive
- major refactoring of gpio-exar
- convert gpio-mvebu pwm access to regmap
- create a new submenu for virtual GPIO drivers
- fix clang fall-through warnings treewide
- minor driver refactoring and tweaks sprinkled all over
-----BEGIN PGP SIGNATURE-----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=RmnM
-----END PGP SIGNATURE-----
Merge tag 'gpio-updates-for-v5.11' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into devel
gpio updates for v5.11-rc1
- several refactoring patches of the core gpiolib code
- add support for NXP PCAL9554B/C to gpio-pca953x
- allow probing mockup devices from device tree
- refactoring and improvements to gpio-rcar
- improvements to locking in gpio-tegra
- code shrink in gpiolib devres
- get the irq offset from device tree in gpio-sifive
- major refactoring of gpio-exar
- convert gpio-mvebu pwm access to regmap
- create a new submenu for virtual GPIO drivers
- fix clang fall-through warnings treewide
- minor driver refactoring and tweaks sprinkled all over
Using CLOCK_REALTIME as the source for event timestamps is crucial for
some specific applications, particularly those requiring timetamps
relative to a PTP clock, so provide an option to switch the event
timestamp source from the default CLOCK_MONOTONIC to CLOCK_REALTIME.
Note that CLOCK_REALTIME was the default source clock for GPIO until
Linux 5.7 when it was changed to CLOCK_MONOTONIC due to issues with the
shifting of the realtime clock.
Providing this option maintains the CLOCK_MONOTONIC as the default,
while also providing a path forward for those dependent on the pre-5.7
behaviour.
Suggested-by: Jack Winch <sunt.un.morcov@gmail.com>
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Link: https://lore.kernel.org/r/20201014231158.34117-2-warthog618@gmail.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
In some cases we would like to have debounce setter which doesn't fail
when a feature is not supported by a controller.
Cc: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Several places in the code are using same idiom, i.e.
IS_ERR(desc) && PTR_ERR(desc) == -ENOENT
which meaning is GPIO description is not found.
For better readability extract gpiod_not_found() helper and use it.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Add support for setting debounce on a line via the GPIO uAPI.
Where debounce is not supported by hardware, a software debounce is
provided.
The implementation of the software debouncer waits for the line to be
stable for the debounce period before determining if a level change,
and a corresponding edge event, has occurred. This provides maximum
protection against glitches, but also introduces a debounce_period
latency to edge events.
The software debouncer is integrated with the edge detection as it
utilises the line interrupt, and integration is simpler than getting
the two to interwork. Where software debounce AND edge detection is
required, the debouncer provides both.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Add support for edge detection to lines requested using
GPIO_V2_GET_LINE_IOCTL.
The edge_detector implementation is based on the v1 lineevent
implementation. Unlike the v1 implementation, an overflow of the event
buffer results in discarding older events, rather than the most
recent, so the final event in a burst will correspond to the current
state of the line.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Replace usage of atomic_notifier_call_chain with
blocking_notifier_call_chain as the notifier function,
lineinfo_changed_notify, calls gpio_desc_to_lineinfo,
which calls pinctrl_gpio_can_use_line, which can sleep.
The chain isn't being called from an atomic context so the
the blocking notifier is a suitable substitute.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Move gpiolib-sysfs function declarations into their own header.
These functions are in gpiolib-sysfs.c, and are only required by gpiolib.c,
and so should be in a module header, not gpiolib.h.
This brings gpiolib-sysfs into line with gpiolib-cdev, and is another step
towards removing the sysfs inferface.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
As GPIO hogs are configured at GPIO controller initialization time,
adding/removing GPIO hogs in DT overlays does not work.
Add support for GPIO hogs described in DT overlays by registering an OF
reconfiguration notifier, to handle the addition and removal of GPIO hog
subnodes to/from a GPIO controller device node.
Note that when a GPIO hog device node is being removed, its "gpios"
properties is no longer available, so we have to keep track of which
node a hog belongs to, which is done by adding a pointer to the hog's
device node to struct gpio_desc.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20200220130149.26283-3-geert+renesas@glider.be
Reviewed-by: Frank Rowand <frank.rowand@sony.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Currently there is no way for user-space to be informed about changes
in status of GPIO lines e.g. when someone else requests the line or its
config changes. We can only periodically re-read the line-info. This
is fine for simple one-off user-space tools, but any daemon that provides
a centralized access to GPIO chips would benefit hugely from an event
driven line info synchronization.
This patch adds a new ioctl() that allows user-space processes to reuse
the file descriptor associated with the character device for watching
any changes in line properties. Every such event contains the updated
line information.
Currently the events are generated on three types of status changes: when
a line is requested, when it's released and when its config is changed.
The first two are self-explanatory. For the third one: this will only
happen when another user-space process calls the new SET_CONFIG ioctl()
as any changes that can happen from within the kernel (i.e.
set_transitory() or set_debounce()) are of no interest to user-space.
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
- improvements in the gpio-pca953x driver
- use platform_irq_count() in gpio-mvebu and gpio-bcm-kona
- remove unneeded MODULE_VERSION() usage in the gpio directory
- irq-related improvements in gpio-tegra driver
- several improvements for the core subsystem code: fix confusing indentation,
fix int type casting, unduplicate code in several places
-----BEGIN PGP SIGNATURE-----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=ia2k
-----END PGP SIGNATURE-----
Merge tag 'gpio-updates-for-v5.6-part1' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into devel
gpio updates for v5.6
- improvements in the gpio-pca953x driver
- use platform_irq_count() in gpio-mvebu and gpio-bcm-kona
- remove unneeded MODULE_VERSION() usage in the gpio directory
- irq-related improvements in gpio-tegra driver
- several improvements for the core subsystem code: fix confusing indentation,
fix int type casting, unduplicate code in several places
gpiochip_get_desc() takes a u16 hwnum, but it turns out most users don't
respect that and usually pass an unsigned int. Since implicit casting to
a smaller type is dangerous - let's change the type of hwnum to unsigned
int in gpiochip_get_desc() and in gpiochip_request_own_desc() where the
size of hwnum is not respected either and who's a user of the former.
This is safe as we then check the hwnum against the number of lines
before proceeding in gpiochip_get_desc().
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
The string literal "gpiochip" is used in several places.
Add a definition for it, and use it everywhere, to make sure everything
stays in sync.
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/20191127084253.16356-2-geert+renesas@glider.be
Reviewed-by: Ulrich Hecht <uli+renesas@fpond.eu>
Reviewed-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Allow pull up/down bias to be disabled, allowing the line to float
or to be biased only by external circuitry.
Use case is for where the bias has been applied previously, either
by default or by the user, but that setting may conflict with the
current use of the line.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
This is a follow up to the commit
f626d6dfb7 ("gpio: of: Break out OF-only code")
which broke down OF parts of GPIO library. Here we do the similar to ACPI.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20190730104337.21235-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
The core gpiolib should not contain any OF/device tree-only
code. Try to break out the main part of it and push it down
into the optional gpiolib-of.c part of the library.
Create a local gpiolib-of.h header and move stuff around a
bit to get a clean cut.
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20190717071001.3858-1-linus.walleij@linaro.org
For spinlocks the type spinlock_t should be used instead of "struct
spinlock".
Use spinlock_t for spinlock's definition.
Cc: linux-gpio@vger.kernel.org
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Link: https://lore.kernel.org/r/20190704153803.12739-8-bigeasy@linutronix.de
Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Core changes:
- The gpiolib MMIO driver has been enhanced to handle two direction
registers, i.e. one register to set lines as input and one register
to set lines as output. It turns out some silicon engineer thinks
the ability to configure a line as input and output at the same
time makes sense, this can be debated but includes a lot of analog
electronics reasoning, and the registers are there and need to
be handled consistently. Unsurprisingly, we enforce the lines to
be either inputs or outputs in such schemes.
- Send in the proper argument value to .set_config() dispatched to
the pin control subsystem. Nobody used it before, now someone
does, so fix it to work as expected.
- The ACPI gpiolib portions can now handle pin bias setting (pull up
or pull down). This has been in the ACPI spec for years and we
finally have it properly integrated with Linux GPIOs. It was based
on an observation from Andy Schevchenko that Thomas Petazzoni's
changes to the core for biasing the PCA950x GPIO expander actually
happen to fit hand-in-glove with what the ACPI core needed.
Such nice synergies happen sometimes.
New drivers:
- A new driver for the Mellanox BlueField GPIO controller. This is
using 64bit MMIO registers and can configure lines as inputs
and outputs at the same time and after improving the MMIO library
we handle it just fine. Interesting.
- A new IXP4xx proper gpiochip driver with hierarchical interrupts
should be coming in from the ARM SoC tree as well.
Driver enhancements:
- The PCA053x driver handles the CAT9554 GPIO expander.
- The PCA053x driver handles the NXP PCAL6416 GPIO expander.
- Wake-up support on PCA053x GPIO lines.
- OMAP now does a nice asynchronous IRQ handling on wake-ups by
letting everything wake up on edges, and this makes runtime PM
work as expected too.
Misc:
- Several cleanups such as devres fixes.
- Get rid of some languager comstructs that cause problems when
compiling with LLVMs clang.
- Documentation review and update.
-----BEGIN PGP SIGNATURE-----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=rhto
-----END PGP SIGNATURE-----
Merge tag 'gpio-v5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio
Pull gpio updates from Linus Walleij:
"This is the bulk of the GPIO changes for the v5.2 kernel cycle. A bit
later than usual because I was ironing out my own mistakes. I'm
holding some stuff back for the next kernel as a result, and this
should be a healthy and well tested batch.
Core changes:
- The gpiolib MMIO driver has been enhanced to handle two direction
registers, i.e. one register to set lines as input and one register
to set lines as output. It turns out some silicon engineer thinks
the ability to configure a line as input and output at the same
time makes sense, this can be debated but includes a lot of analog
electronics reasoning, and the registers are there and need to be
handled consistently. Unsurprisingly, we enforce the lines to be
either inputs or outputs in such schemes.
- Send in the proper argument value to .set_config() dispatched to
the pin control subsystem. Nobody used it before, now someone does,
so fix it to work as expected.
- The ACPI gpiolib portions can now handle pin bias setting (pull up
or pull down). This has been in the ACPI spec for years and we
finally have it properly integrated with Linux GPIOs. It was based
on an observation from Andy Schevchenko that Thomas Petazzoni's
changes to the core for biasing the PCA950x GPIO expander actually
happen to fit hand-in-glove with what the ACPI core needed. Such
nice synergies happen sometimes.
New drivers:
- A new driver for the Mellanox BlueField GPIO controller. This is
using 64bit MMIO registers and can configure lines as inputs and
outputs at the same time and after improving the MMIO library we
handle it just fine. Interesting.
- A new IXP4xx proper gpiochip driver with hierarchical interrupts
should be coming in from the ARM SoC tree as well.
Driver enhancements:
- The PCA053x driver handles the CAT9554 GPIO expander.
- The PCA053x driver handles the NXP PCAL6416 GPIO expander.
- Wake-up support on PCA053x GPIO lines.
- OMAP now does a nice asynchronous IRQ handling on wake-ups by
letting everything wake up on edges, and this makes runtime PM work
as expected too.
Misc:
- Several cleanups such as devres fixes.
- Get rid of some languager comstructs that cause problems when
compiling with LLVMs clang.
- Documentation review and update"
* tag 'gpio-v5.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (85 commits)
gpio: Update documentation
docs: gpio: convert docs to ReST and rename to *.rst
gpio: sch: Remove write-only core_base
gpio: pxa: Make two symbols static
gpiolib: acpi: Respect pin bias setting
gpiolib: acpi: Add acpi_gpio_update_gpiod_lookup_flags() helper
gpiolib: acpi: Set pin value, based on bias, more accurately
gpiolib: acpi: Change type of dflags
gpiolib: Introduce GPIO_LOOKUP_FLAGS_DEFAULT
gpiolib: Make use of enum gpio_lookup_flags consistent
gpiolib: Indent entry values of enum gpio_lookup_flags
gpio: pca953x: add support for pca6416
dt-bindings: gpio: pca953x: document the nxp,pca6416
gpio: pca953x: add pcal6416 to the of_device_id table
gpio: gpio-omap: Remove conditional pm_runtime handling for GPIO interrupts
gpio: gpio-omap: configure edge detection for level IRQs for idle wakeup
tracing: stop making gpio tracing configurable
gpio: pca953x: Configure wake-up path when wake-up is enabled
gpio: of: Optimize quirk checks
gpio: mmio: Drop bgpio_dir_inverted
...
For now, we don't take into account the pin bias settings supplied by ACPI.
This change is targeting the mentioned gap.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This helper consolidates all settings of GPIO descriptor lookup flags and
quirks in the future if any.
No functional change intended.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
The library uses enum gpio_lookup_flags to define the possible
characteristics of GPIO pin. Since enumerator listed only individual
bits the common use of it is in a form of a bitmask of
gpio_lookup_flags GPIO_* values. The more correct type for this is
unsigned long.
Due to above convert all users to use unsigned long instead of
enum gpio_lookup_flags except enumerator definition.
While here, make field and parameter descriptions consistent as well.
Suggested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This function is needed in mcp23s08. That driver is a special snowflake
because it supports several hardware chips as a single "GPIO chip" under
Linux.
Signed-off-by: Jan Kundrát <jan.kundrat@cesnet.cz>
Cc: Linus Walleij <linus.walleij@linaro.org>
Cc: Phil Reid <preid@electromag.com.au>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit adds support for configuring the pull-up and pull-down
resistors available in some GPIO controllers. While configuring
pull-up/pull-down is already possible through the pinctrl subsystem,
some GPIO controllers, especially simple ones such as GPIO expanders
on I2C, don't have any pinmuxing capability and therefore do not use
the pinctrl subsystem.
This commit implements the GPIO_PULL_UP and GPIO_PULL_DOWN flags,
which can be used from the Device Tree, to enable a pull-up or
pull-down resistor on a given GPIO.
The flag is simply propagated all the way to the core GPIO subsystem,
where it is used to call the gpio_chip ->set_config callback with the
appropriate existing PIN_CONFIG_BIAS_* values.
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This function already exist inside gpiolib, we were just
reluctant to make it available to the kernel at large as
the devm_* seemed to be enough for anyone.
However we found out that regulators need to do their own
lifecycle/refcounting on GPIO descriptors and explicitly
call gpiod_put() when done with a descriptor, so export
this function so we can hand the refcounting over to the
regulator core for these descriptors after retrieveal.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Marek Szyprowski <m.szyprowski@samsung.com>
Tested-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Charles Keepax <ckeepax@opensource.cirrus.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Use the SPDX headers and cut down on boilerplate to indicate the
license in the core gpiolib implementation.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
In order to make use of array info obtained from gpiod_get_array() and
speed up processing of arrays matching single GPIO chip layout, that
information must be passed to get/set array functions. Extend the
functions' API with that additional parameter and update all users.
Pass NULL if a user builds an array itself from single GPIOs.
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Peter Korsgaard <peter.korsgaard@barco.com>
Cc: Peter Rosin <peda@axentia.se>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Rojhalat Ibrahim <imr@rtschenk.de>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Yegor Yefremov <yegorslists@googlemail.com>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Certain GPIO array lookup results may map directly to GPIO pins of a
single GPIO chip in hardware order. If that condition is recognized
and handled efficiently, significant performance gain of get/set array
functions may be possible.
While processing a request for an array of GPIO descriptors, identify
those which represent corresponding pins of a single GPIO chip. Skip
over pins which require open source or open drain special processing.
Moreover, identify pins which require inversion. Pass a pointer to
that information with the array to the caller so it can benefit from
enhanced performance as soon as get/set array functions can accept and
make efficient use of it.
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Most users of get/set array functions iterate consecutive bits of data,
usually a single integer, while processing array of results obtained
from, or building an array of values to be passed to those functions.
Save time wasted on those iterations by changing the functions' API to
accept bitmaps.
All current users are updated as well.
More benefits from the change are expected as soon as planned support
for accepting/passing those bitmaps directly from/to respective GPIO
chip callbacks if applicable is implemented.
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Miguel Ojeda Sandonis <miguel.ojeda.sandonis@gmail.com>
Cc: Sebastien Bourdelin <sebastien.bourdelin@savoirfairelinux.com>
Cc: Lukas Wunner <lukas@wunner.de>
Cc: Peter Korsgaard <peter.korsgaard@barco.com>
Cc: Peter Rosin <peda@axentia.se>
Cc: Andrew Lunn <andrew@lunn.ch>
Cc: Florian Fainelli <f.fainelli@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Rojhalat Ibrahim <imr@rtschenk.de>
Cc: Dominik Brodowski <linux@dominikbrodowski.net>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Tony Lindgren <tony@atomide.com>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Michael Hennerich <Michael.Hennerich@analog.com>
Cc: Jonathan Cameron <jic23@kernel.org>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jslaby@suse.com>
Cc: Yegor Yefremov <yegorslists@googlemail.com>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@gmail.com>
Acked-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
GPIO drivers call gpiochip_(un)lock_as_irq whenever they want to use a gpio
as an interrupt. This is done when the irq is requested and it marks the
gpio as in use by an interrupt.
This is problematic for cases where a gpio pin is used as an interrupt
pin, then, after the irq is disabled, is used as a regular gpio pin.
Currently it is not possible to do this other than by first freeing
the interrupt so gpiochip_unlock_as_irq is called, since an attempt to
switch the gpio direction for output will fail since gpiolib believes
that the gpio is in use for an interrupt and it does not know that it
the irq is actually disabled.
There are currently two drivers that would like to be able to do this:
the tda998x_drv.c driver where a regular gpio pin needs to be temporarily
reconfigured as an interrupt pin during CEC calibration, and the cec-gpio
driver where you want to configure the gpio pin as an interrupt while
waiting for traffic over the CEC bus, or as a regular pin when receiving or
transmitting a CEC message.
The solution is to add a new flag that is set when the irq is enabled,
and have gpiod_direction_output check for that flag.
We also add functions that drivers that do not use GPIOLIB_IRQCHIP
can call when they enable/disable the irq.
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Since we put static variable to a header file it's copied to each module
that includes the header. But not all of them are actually used it.
Mark gpio_suffixes array with __maybe_unused to hide a compiler warning:
In file included from
drivers/gpio/gpiolib-legacy.c:6:0:
drivers/gpio/gpiolib.h:95:27: warning: ‘gpio_suffixes’ defined but not used [-Wunused-const-variable=]
static const char * const gpio_suffixes[] = { "gpios", "gpio" };
^~~~~~~~~~~~~
In file included from drivers/gpio/gpiolib-devprop.c:17:0:
drivers/gpio/gpiolib.h:95:27: warning: ‘gpio_suffixes’ defined but not used [-Wunused-const-variable=]
static const char * const gpio_suffixes[] = { "gpios", "gpio" };
^~~~~~~~~~~~~
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
The new challenge is to remove VLAs from the kernel
(see https://lkml.org/lkml/2018/3/7/621) to eventually
turn on -Wvla.
Using a kmalloc array is the easy way to fix this but kmalloc is still
more expensive than stack allocation. Introduce a fast path with a
fixed size stack array to cover most chip with gpios below some fixed
amount. The slow path dynamically allocates an array to cover those
chips with a large number of gpios.
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Phil Reid <preid@electromag.com.au>
Reviewed-and-tested-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Signed-off-by: Laura Abbott <labbott@redhat.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
David Arcari
Izabela Bakollari
Shaoqin Huang
Al Stone
Linus Walleij
Kent Gibson
Andy Shevchenko
Geert Uytterhoeven
Bartosz Golaszewski
Sebastian Andrzej Siewior
Linus Torvalds
Jan Kundrát
Thomas Petazzoni
Janusz Krzysztofik
Hans Verkuil
Laura Abbott