GpioIo() resources don't contain an initial value for the output pin.
Therefore instead of deducting its value solely based on bias field
we should deduce that value from the polarity and the bias fields.
Typical scenario is, when pin is defined in the table and its polarity,
specified in _DSD or via platform code, is defined as active low,
in the following call chain:

  -> acpi_populate_gpio_lookup()
     -> acpi_gpio_to_gpiod_flags()

it will return GPIOD_OUT_HIGH if bias is set no matter if polarity
is GPIO_ACTIVE_LOW, so it will return the current level instead of
the logical level.

Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Vasile-Laurentiu Stanimir <vasile-laurentiu.stanimir@windriver.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Move acpi_gpio_to_gpiod_flags() upper in the code to allow further refactoring.
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>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Mika noticed that some code is run under mutex when it doesn't require
the lock, like an error code assignment.

Move non-critical code outside of critical section.
Suggested-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>

We didn't take into account the debounce settings supplied by ACPI.
This change is targeting the mentioned gap.
Reported-by: Coiby Xu <coiby.xu@gmail.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>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Use named item instead of plain integer for enum gpiod_flags
to make it clear that even 0 has its own meaning.
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>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>

In some cases the GpioInt() resource is coming with bias settings
which may affect system functioning. Respect bias settings for
GpioInt() resource by calling acpi_gpio_update_gpiod_*flags() API
in acpi_dev_gpio_irq_get().
Reported-by: Jamie McClymont <jamie@kwiius.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>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>

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>

This function is useful for internal use in the GPIO library.
There will be new user coming, prepare a helper for the new comer
and the existing ones.
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>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Move bias related code from gpio_set_config() to gpio_set_bias().
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>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>

In the future we will need to have a separate function
that takes an arbitrary argument value.

Extract gpio_set_config_with_argument() for that purpose.
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>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Instead of open coded macro use, call pinconf_to_config_packed().
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>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>

It's no difference in the functionality, but after the change the code
is less error prone to various checkers.
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>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Replace unsigned by unsigned int in GPIO library code.
Note, legacy API left untouched.
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>
Reviewed-by: Mika Westerberg <mika.westerberg@linux.intel.com>

intel-pinctrl for v5.10-2

* Respect bias setting when comes from ACPI

The following is an automated git shortlog grouped by driver:

intel:
 -  Set default bias in case no particular value given
 -  Fix 2 kOhm bias which is 833 Ohm

Fix the check on the number of IRQs to allow up to the maximum (32)
instead of only the maximum minus one.

Fixes: 96868dce ("gpio/sifive: Add GPIO driver for SiFive SoCs")
Cc: stable@vger.kernel.org
Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Link: https://lore.kernel.org/r/20201107081420.60325-10-damien.lemoal@wdc.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Merge tag 'gpio-fixes-for-v5.10-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux into fixes

gpio fixes for v5.10-rc3

- fix missing conversion to gpiolib irqchip in gpio-dwapb
- fix bank properties for ast2600 variant in gpio-aspeed
- make sysfs work again when the character device is disabled
- fix interrupt handling in gpio-pcie-idio-24

This enables the PEX8311 internal PCI wire interrupt and the PEX8311
local interrupt input so the local interrupts are forwarded to the PCI.

Fixes: 58556204 ("gpio: Add GPIO support for the ACCES PCIe-IDIO-24 family")
Cc: stable@vger.kernel.org
Signed-off-by: Arnaud de Turckheim <quarium@gmail.com>
Reviewed-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

This fixes the COS Enable Register value for enabling/disabling the
corresponding IRQs bank.

Fixes: 58556204 ("gpio: Add GPIO support for the ACCES PCIe-IDIO-24 family")
Cc: stable@vger.kernel.org
Signed-off-by: Arnaud de Turckheim <quarium@gmail.com>
Reviewed-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Fix the bitwise operation to remove only the corresponding bit from the
mask.

Fixes: 58556204 ("gpio: Add GPIO support for the ACCES PCIe-IDIO-24 family")
Cc: stable@vger.kernel.org
Signed-off-by: Arnaud de Turckheim <quarium@gmail.com>
Reviewed-by: William Breathitt Gray <vilhelm.gray@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

In gpiochip_setup_dev() the call to gpiolib_cdev_register() indirectly
calls device_add().  This is still required for the sysfs even when
CONFIG_GPIO_CDEV is not selected in the build.

Replace the stubbed functions in gpiolib-cdev.h with macros in gpiolib.c
that perform the required device_add() and device_del() when
CONFIG_GPIO_CDEV is not selected.

Fixes: d143493c (gpiolib: make cdev a build option)
Reported-by: Nicolas Schichan <nschichan@freebox.fr>
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Tested-by: Nicolas Schichan <nschichan@freebox.fr>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Address code indentation warning messages by checkpatch script. Combine
split function parameters on one line. This also resolves the "use tabs
instead of space" warning by checkpatch script.
Signed-off-by: Deepak R Varma <mh12gx2825@gmail.com>

Link: https://lore.kernel.org/r/20201013190212.GA85788@ubuntu204Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

This reverts commit 579ced8f.

Turns out I was overly optimistic about cpu_pm blocking idle being a
solution for handling edge interrupts. While it helps in preventing
entering idle states that potentially lose context, we can still get
an edge interrupt triggering while entering idle. So we need to also
add back the workaround for seeing if there are any pending edge
interrupts when waking up.
Signed-off-by: Tony Lindgren <tony@atomide.com>
Cc: Aaro Koskinen <aaro.koskinen@iki.fi>
Cc: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Keerthy <j-keerthy@ti.com>
Cc: Ladislav Michl <ladis@linux-mips.org>
Cc: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: Russell King <rmk+kernel@armlinux.org.uk>
Cc: Tero Kristo <t-kristo@ti.com>
Link: https://lore.kernel.org/r/20201028060556.56038-1-tony@atomide.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

We actually handle the gpio_irq_chip set-up properly
now despite what the comment says. Also assign this
pointer along with the rest of the gpio_irq_chip
setup code.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20201019134429.65563-1-linus.walleij@linaro.org

Now that all gpiolib irqchip users have been over to use
the irqchip template, we can finally retire the old code
path and leave just one way in to the irqchip: set up the
template when registering the gpio_chip. For a while
we had two code paths for this which was a bit confusing.

This brings this work to a conclusion, there is now one
way of doing this.
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
Link: https://lore.kernel.org/r/20201019134046.65101-1-linus.walleij@linaro.org

Use the new compat_need_64bit_alignment_fixup() helper to avoid
ugly ifdeffery in IOCTL compatibility code.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Kent Gibson <warthog618@gmail.com>
Depends-on: 527c4125 ("compat: add a compat_need_64bit_alignment_fixup() helper")
Link: https://lore.kernel.org/r/20201014103315.82662-1-andriy.shevchenko@linux.intel.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

First of all, bias has a special type as being a part of enum pin_config_param.
Second, 0 is also defined bias which is equivalent to BUS_HOLD.

Taking into account above, change type of bias variable and refactor
gpio_set_bias() in a way that it doesn't use BUS_HOLD as a place holder.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Link: https://lore.kernel.org/r/20201009184359.16427-1-andriy.shevchenko@linux.intel.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Clarify that a char array containing a string is considered 'empty' if
the first character is the null terminator. The remaining characters
are not relevant to this determination.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20201005070329.21055-6-warthog618@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Remove leading whitespace in ABI v1 comment.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20201005070329.21055-5-warthog618@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Add kernel-doc formatting to all references to structs, enums, fields
and constants, and move deprecation warnings into the Note section of
the deprecated struct.

Replace 'OR:ed' with 'added', as the former looks odd.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20201005070329.21055-4-warthog618@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Make debounce_period_us field documentation consistent with other fields
in the union.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20201005070329.21055-3-warthog618@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

Fix kernel-doc warnings, specifically gpioline_info_changed.padding is
not documented and 'GPIO event types' describes defines, which are not
documented by kernel-doc.
Signed-off-by: Kent Gibson <warthog618@gmail.com>
Reviewed-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Link: https://lore.kernel.org/r/20201005070329.21055-2-warthog618@gmail.comSigned-off-by: Linus Walleij <linus.walleij@linaro.org>

GPIO_T is mapped to the most significant byte of input/output mask, and
the byte in "output" mask should be 0 because GPIO_T is input only. All
the other bits need to be 1 because GPIO_Q/R/S support both input and
output modes.

Fixes: ab4a8553 ("gpio: aspeed: Add in ast2600 details to Aspeed driver")
Signed-off-by: Billy Tsai <billy_tsai@aspeedtech.com>
Reviewed-by: Tao Ren <rentao.bupt@gmail.com>
Reviewed-by: Joel Stanley <joel@jms.id.au>
Reviewed-by: Andrew Jeffery <andrew@aj.id.au>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

Commit 0ea68393 ("gpio: dwapb: Convert driver to using the
GPIO-lib-based IRQ-chip") missed the case in dwapb_irq_set_wake().

Without this fix, probing the dwapb gpio driver will hit a error:
"address between user and kernel address ranges" on a Ampere armv8a
server and cause a panic.

Fixes: 0ea68393 ("gpio: dwapb: Convert driver to using the GPIO-lib-based IRQ-chip")
Signed-off-by: Jia He <justin.he@arm.com>
Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: Serge Semin <fancer.lancer@gmail.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>

When GPIO library asks pin control to set the bias, it doesn't pass
any value of it and argument is considered boolean (and this is true
for ACPI GpioIo() / GpioInt() resources, by the way). Thus, individual
drivers must behave well, when they got the resistance value of 1 Ohm,
i.e. transforming it to sane default.

In case of Intel pin control hardware the 5 kOhm sounds plausible
because on one hand it's a minimum of resistors present in all
hardware generations and at the same time it's high enough to minimize
leakage current (will be only 200 uA with the above choice).

Fixes: e57725ea ("pinctrl: intel: Add support for hardware debouncer")
Reported-by: Jamie McClymont <jamie@kwiius.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>

2 kOhm bias was never an option in Intel GPIO hardware, the available
matrix is:

	000	none
	001	1 kOhm (if available)
	010	5 kOhm
	100	20 kOhm

As easy to get the 3 resistors are gated separately and according to
parallel circuits calculations we may get combinations of the above where
the result is always strictly less than minimal resistance. Hence,
additional values can be:

	011	~833.3 Ohm
	101	~952.4 Ohm
	110	~4 kOhm
	111	~800 Ohm

That said, convert TERM definitions to be the bit masks to reflect the above.

While at it, enable the same setting for pull down case.

Fixes: 7981c001 ("pinctrl: intel: Add Intel Sunrisepoint pin controller and GPIO support")
Cc: Jamie McClymont <jamie@kwiius.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>

Use a more generic form for __section that requires quotes to avoid
complications with clang and gcc differences.

Remove the quote operator # from compiler_attributes.h __section macro.

Convert all unquoted __section(foo) uses to quoted __section("foo").
Also convert __attribute__((section("foo"))) uses to __section("foo")
even if the __attribute__ has multiple list entry forms.

Conversion done using the script at:

    https://lore.kernel.org/lkml/75393e5ddc272dc7403de74d645e6c6e0f4e70eb.camel@perches.com/2-convert_section.plSigned-off-by: Joe Perches <joe@perches.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@gooogle.com>
Reviewed-by: Miguel Ojeda <ojeda@kernel.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

tid_addr is not a "pointer to (pointer to int in userspace)"; it is in
fact a "pointer to (pointer to int in userspace) in userspace".  So
sparse rightfully complains about passing a kernel pointer to
put_user().
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Commit 453431a5 ("mm, treewide: rename kzfree() to
kfree_sensitive()") renamed kzfree() to kfree_sensitive(),
but it left a compatibility definition of kzfree() to avoid
being too disruptive.

Since then a few more instances of kzfree() have slipped in.

Just get rid of them and remove the compatibility definition
once and for all.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>