Commit Graph

35 Commits

Author SHA1 Message Date
Andy Shevchenko 9a9982d460 gpio: 74x164: Convert to use SPDX identifier
Reduce size of duplicated comments by switching to use SPDX identifier.

No functional change.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
2019-03-26 18:38:07 +01:00
Andy Shevchenko 517ec43927 gpio: 74x164: Remove linux/init.h and sort headers
There is no need to include linux/init.h when at the same time
we include linux/module.h.

Remove redundant inclusion.

While here, sort header block alphabetically for easy maintenance.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
2019-03-26 18:37:47 +01:00
Andy Shevchenko 3c7469514d gpio: 74x164: Make use of device properties
ACPI-enabled platforms can use this device via unified device
properties API. Convert driver to support this.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Bartosz Golaszewski <bgolaszewski@baylibre.com>
2019-03-26 18:37:18 +01:00
Linus Torvalds 9798f5178f The is the bulk of GPIO changes for the v4.16 kernel cycle.
Core changes:
 
 - Disallow open drain and open source flags to be set
   simultaneously. This doesn't make electrical sense, and would
   the hardware actually respond to this setting, the result
   would be short circuit.
 
 - ACPI GPIO has a new core infrastructure for handling quirks.
   The quirks are there to deal with broken ACPI tables centrally
   instead of pushing the work to individual drivers. In the world
   of BIOS writers, the ACPI tables are perfect. Until they find a
   mistake in it. When such a mistake is found, we can patch it
   with a quirk. It should never happen, the problem is that it
   happens. So we accomodate for it.
 
 - Several documentation updates.
 
 - Revert the patch setting up initial direction state from
   reading the device. This was causing bad things for drivers
   that can't read status on all its pins. It is only affecting
   debugfs information quality.
 
 - Label descriptors with the device name if no explicit label is
   passed in.
 
 - Pave the ground for transitioning SPI and regulators to use
   GPIO descriptors by implementing some quirks in the device tree
   GPIO parsing code.
 
 New drivers:
 
 - New driver for the Access PCIe IDIO 24 family.
 
 Other:
 
 - Major refactorings and improvements to the GPIO mockup driver
   used for test and verification.
 
 - Moved the AXP209 driver over to pin control since it gained a
   pin control back-end. These patches will appear (with the same
   hashes) in the pin control pull request as well.
 
 - Convert the onewire GPIO driver w1-gpio to use descriptors.
   This is merged here since the W1 maintainers send very few
   pull requests and he ACKed it.
 
 - Start to clean up driver headers using <linux/gpio.h> to just
   use <linux/gpio/driver.h> as appropriate.
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Merge tag 'gpio-v4.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio

Pull GPIO updates from Linus Walleij:
 "The is the bulk of GPIO changes for the v4.16 kernel cycle. It is
  pretty calm this time around I think. I even got time to get to things
  like starting to clean up header includes.

  Core changes:

   - Disallow open drain and open source flags to be set simultaneously.
     This doesn't make electrical sense, and would the hardware actually
     respond to this setting, the result would be short circuit.

   - ACPI GPIO has a new core infrastructure for handling quirks. The
     quirks are there to deal with broken ACPI tables centrally instead
     of pushing the work to individual drivers. In the world of BIOS
     writers, the ACPI tables are perfect. Until they find a mistake in
     it. When such a mistake is found, we can patch it with a quirk. It
     should never happen, the problem is that it happens. So we
     accomodate for it.

   - Several documentation updates.

   - Revert the patch setting up initial direction state from reading
     the device. This was causing bad things for drivers that can't read
     status on all its pins. It is only affecting debugfs information
     quality.

   - Label descriptors with the device name if no explicit label is
     passed in.

   - Pave the ground for transitioning SPI and regulators to use GPIO
     descriptors by implementing some quirks in the device tree GPIO
     parsing code.

  New drivers:

   - New driver for the Access PCIe IDIO 24 family.

  Other:

   - Major refactorings and improvements to the GPIO mockup driver used
     for test and verification.

   - Moved the AXP209 driver over to pin control since it gained a pin
     control back-end. These patches will appear (with the same hashes)
     in the pin control pull request as well.

   - Convert the onewire GPIO driver w1-gpio to use descriptors. This is
     merged here since the W1 maintainers send very few pull requests
     and he ACKed it.

   - Start to clean up driver headers using <linux/gpio.h> to just use
     <linux/gpio/driver.h> as appropriate"

* tag 'gpio-v4.16-1' of git://git.kernel.org/pub/scm/linux/kernel/git/linusw/linux-gpio: (103 commits)
  gpio: Timestamp events in hardirq handler
  gpio: Fix kernel stack leak to userspace
  gpio: Fix a documentation spelling mistake
  gpio: Documentation update
  gpiolib: remove redundant initialization of pointer desc
  gpio: of: Fix NPE from OF flags
  gpio: stmpe: Delete an unnecessary variable initialisation in stmpe_gpio_probe()
  gpio: stmpe: Move an assignment in stmpe_gpio_probe()
  gpio: stmpe: Improve a size determination in stmpe_gpio_probe()
  gpio: stmpe: Use seq_putc() in stmpe_dbg_show()
  gpio: No NULL owner
  gpio: stmpe: i2c transfer are forbiden in atomic context
  gpio: davinci: Include proper header
  gpio: da905x: Include proper header
  gpio: cs5535: Include proper header
  gpio: crystalcove: Include proper header
  gpio: bt8xx: Include proper header
  gpio: bcm-kona: Include proper header
  gpio: arizona: Include proper header
  gpio: amd8111: Include proper header
  ...
2018-01-31 12:25:27 -08:00
Linus Walleij 91f6a4afd1 gpio: 74x174: Include proper headers
This driver has no business including <linux/gpio.h> or
<linux/of_gpio.h>. Cut them and include <linux/gpio/driver.h>
and <linux/gpio/consumer.h> which is it they really needs.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2018-01-13 22:07:09 +01:00
Geert Uytterhoeven a158531f3c gpio: 74x164: Fix crash during .remove()
Commit 7ebc194d0f ("gpio: 74x164: Introduce 'enable-gpios'
property") added a new member gpiod_oe to the end of the struct
gen_74x164_chip, after the zero-length buffer array.

However, this buffer is a flexible array, allocated together with the
structure during .probe().  As the buffer is no longer the last member,
writing to it corrupts the newly added member after it.
During device removal, the corrupted member will be used as a pointer,
leading to a crash.

This went unnoticed, as the flexible array was declared as "buffer[0]"
instead of "buffer[]", and thus did not trigger a "flexible array member
not at end of struct" error from gcc.

Move the gpiod_oe field up to fix this, and drop the zero from the array
size to prevent future similar bugs.

Fixes: 7ebc194d0f ("gpio: 74x164: Introduce 'enable-gpios' property")
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-11-30 15:31:14 +01:00
Fabio Estevam 7ebc194d0f gpio: 74x164: Introduce 'enable-gpios' property
74HC595 has an /OE (output enable) pin that can be controlled by a GPIO.

Introduce an optional property called 'enable-gpios' that allows
controlling the /OE pin.

Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2017-08-14 16:24:02 +02:00
Geert Uytterhoeven 771d899add gpio: 74x164: Use spi_write() helper instead of open coding
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-06-23 11:07:12 +02:00
Nicolas Saenz Julienne 80018bd9cb gpio: 74x164: add dt support for nxp's 74x594
The chip is also an 8 bit shift register which works out of the box as a GPO
expander with this patch

Signed-off-by: Nicolas Saenz Julienne <nicolassaenzj@gmail.com>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-03-31 10:25:51 +02:00
Geert Uytterhoeven d46ab68239 gpio: 74x164: Implement gpiochip.set_multiple()
This allows to set multiple outputs using a single SPI transfer.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Phil Reid <preid@electromag.com.au>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-03-30 10:38:50 +02:00
Linus Walleij b2afc6f352 gpio: 74x164: use gpiochip data pointer
This makes the driver use the data pointer added to the gpio_chip
to store a pointer to the state container instead of relying on
container_of().

Cc: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2016-01-05 11:21:01 +01:00
Geert Uytterhoeven 902e7e6008 gpio: 74x164: Use a single SPI transfer instead of multiple transfers
Currently the 74x164 driver assembles an SPI message from an array of
one-byte SPI transfers, one for each daisy-chained shift register, as
the first byte sent will end up in the last register.
This array is allocated and deallocated on each GPIO write access.

By storing the data in the internal buffer in reverse order, we can
use a single SPI transfer with the internal buffer directly, simplifying
the code a lot, and avoiding memory (de)allocations.

This also avoids transient values on the GPIO outputs when using an SPI
master that cannot keep the hardware chip select asserted in between
multiple transfers (and would need cs-gpios for proper operation).

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Cc: Mark Brown <broonie@kernel.org>
[Rebased changing .dev to .parent]
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-12-10 17:21:02 +01:00
Geert Uytterhoeven 410f4574f4 gpio: 74x164: Allocate buffer with gen_74x164_chip
By moving the internal buffer to the end of struct gen_74x164_chip and
converting it from a pointer to a zero-sized array, it can be allocated
together with gen_74x164_chip, reducing the number of managed
allocations.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-12-10 17:13:17 +01:00
Linus Walleij 58383c7842 gpio: change member .dev to .parent
The name .dev in a struct is normally reserved for a struct device
that is let us say a superclass to the thing described by the struct.
struct gpio_chip stands out by confusingly using a struct device *dev
to point to the parent device (such as a platform_device) that
represents the hardware. As we want to give gpio_chip:s real devices,
this is not working. We need to rename this member to parent.

This was done by two coccinelle scripts, I guess it is possible to
combine them into one, but I don't know such stuff. They look like
this:

@@
struct gpio_chip *var;
@@
-var->dev
+var->parent

and:

@@
struct gpio_chip var;
@@
-var.dev
+var.parent

and:

@@
struct bgpio_chip *var;
@@
-var->gc.dev
+var->gc.parent

Plus a few instances of bgpio that I couldn't figure out how
to teach Coccinelle to rewrite.

This patch hits all over the place, but I *strongly* prefer this
solution to any piecemal approaches that just exercise patch
mechanics all over the place. It mainly hits drivers/gpio and
drivers/pinctrl which is my own backyard anyway.

Cc: Haavard Skinnemoen <hskinnemoen@gmail.com>
Cc: Rafał Miłecki <zajec5@gmail.com>
Cc: Richard Purdie <rpurdie@rpsys.net>
Cc: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
Cc: Alek Du <alek.du@intel.com>
Cc: Jaroslav Kysela <perex@perex.cz>
Cc: Takashi Iwai <tiwai@suse.com>
Acked-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Acked-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Jiri Kosina <jkosina@suse.cz>
Acked-by: Hans-Christian Egtvedt <egtvedt@samfundet.no>
Acked-by: Jacek Anaszewski <j.anaszewski@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2015-11-19 09:24:35 +01:00
Andrew F. Davis 3821a065f5 spi: Drop owner assignment from spi_drivers
An spi_driver does not need to set an owner, it will be populated by the
driver core.

Signed-off-by: Andrew F. Davis <afd@ti.com>
Acked-by: Jonathan Cameron <jic23@kernel.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
2015-10-28 10:30:17 +09:00
abdoulaye berthe 9f5132ae82 gpio: remove all usage of gpio_remove retval in driver/gpio
Signed-off-by: abdoulaye berthe <berthe.ab@gmail.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2014-07-22 16:39:26 +02:00
Alexander Shiyan bcc0562c77 gpio: 74x164: Driver cleanup
- Removed excess "spi" field from private data.
- Removed excess check for spi_get_drvdata() in remove().
- Removed unneeded message in remove().
- Simplify error path in probe().
- Fixed warnings by scripts/checkfile.pl.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2013-12-12 14:28:12 +01:00
Alexander Shiyan 61e7380403 gpio: 74x164: Remove non-DT support
Commit 20bc4d5d56
(gpio: 74x164: Add support for the daisy-chaining) introduce check
for DT for the driver, so driver cannot be used without DT.
There are no in-tree users of this driver, so remove non-DT support
completely.

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Acked-by: Mark Brown <broonie@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2013-12-12 14:27:57 +01:00
Linus Walleij 9fb1f39eb2 gpio/pinctrl: make gpio_chip members typed boolean
This switches the two members of struct gpio_chip that were
defined as unsigned foo:1 to bool, because that is indeed what
they are. Switch all users in the gpio and pinctrl subsystems
to assign these values with true/false instead of 0/1. The
users outside these subsystems will survive since true/false
is 1/0, atleast we set some kind of more strict typing example.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2013-12-04 14:42:46 +01:00
Sachin Kamat 187a53a5eb gpio: gpio-74x164: Remove redundant of_match_ptr
'gen_74x164_dt_ids' is always compiled in. Hence the macro is not
necessary.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2013-09-23 12:52:21 +02:00
Sachin Kamat 49f1d6bc5a gpio: gpio-74x164: Remove redundant spi_set_drvdata
Driver core sets driver data to NULL upon failure or remove.

Signed-off-by: Sachin Kamat <sachin.kamat@linaro.org>
Cc: Gabor Juhos <juhosg@openwrt.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2013-09-23 12:51:30 +02:00
Jingoo Han e56aee1897 gpio: use dev_get_platdata()
Use the wrapper function for retrieving the platform data instead of
accessing dev->platform_data directly.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2013-08-16 15:24:35 +02:00
Jingoo Han 6c0cf42be3 gpio: 74x164: use spi_get_drvdata() and spi_set_drvdata()
Use the wrapper functions for getting and setting the driver data
using spi_device instead of using dev_{get|set}_drvdata with
&spi->dev, so we can directly pass a struct spi_device.

Signed-off-by: Jingoo Han <jg1.han@samsung.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2013-03-27 16:05:13 +01:00
Bill Pemberton 206210ce68 gpio: remove use of __devexit
CONFIG_HOTPLUG is going away as an option so __devexit is no
longer needed.

Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Cc: Grant Likely <grant.likely@secretlab.ca>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Cc: Peter Tyser <ptyser@xes-inc.com>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-28 11:39:59 -08:00
Bill Pemberton 3836309d93 gpio: remove use of __devinit
CONFIG_HOTPLUG is going away as an option so __devinit is no longer
needed.

Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Peter Tyser <ptyser@xes-inc.com>
Cc: Santosh Shilimkar <santosh.shilimkar@ti.com>
Cc: Kevin Hilman <khilman@ti.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-28 11:39:33 -08:00
Bill Pemberton 8283c4ff57 gpio: remove use of __devexit_p
CONFIG_HOTPLUG is going away as an option so __devexit_p is no longer
needed.

Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Cc: Grant Likely <grant.likely@secretlab.ca>
Cc: Peter Tyser <ptyser@xes-inc.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Acked-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2012-11-28 11:36:36 -08:00
Roland Stigge a48221a26e gpio-74x164: Fix buffer allocation size
The new registers handling in the gpio-74x164 driver allocates chip->registers
* 8 bytes where only one byte per register is necessary. This patch fixes this.

Signed-off-by: Roland Stigge <stigge@antcom.de>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-10-16 19:34:43 +02:00
Maxime Ripard 20bc4d5d56 gpio: 74x164: Add support for the daisy-chaining
The shift registers have an output pin that, when enabled, propagates
the values of its internal register to the pins. If another value comes
to the register while the output pin is disabled, this new value will
makae the older shift into the next register in the chain.

This patch adds support for daisy-chaining the registers, using the
regular SPI chip select mechanism to manage the output pin, and the
registers-number dt property to set the number of chained registers.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-09-11 23:49:32 +02:00
Maxime Ripard 0a90a9fb45 gpio: 74x164: Add device tree support
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Florian Fainelli <florian@openwrt.org>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-09-07 23:05:23 +02:00
Maxime Ripard 061505fd39 gpio: 74x164: Use dynamic gpio number assignment if no pdata is present
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Florian Fainelli <florian@openwrt.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-09-07 23:04:02 +02:00
Maxime Ripard 72eac3020d gpio: 74x164: Use devm_kzalloc
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Florian Fainelli <florian@openwrt.org>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-09-07 23:01:43 +02:00
Maxime Ripard ab3b878261 gpio: 74x164: Use module_spi_driver boiler plate function
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Acked-by: Florian Fainelli <florian@openwrt.org>
Acked-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2012-09-07 23:00:32 +02:00
Paul Gortmaker bb207ef1e8 drivers/gpio: Fix drivers who are implicit users of module.h
A pending cleanup will mean that module.h won't be implicitly
everywhere anymore.  Make sure the modular drivers in gpio
are actually calling out for <module.h> explicitly in advance.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-31 19:31:47 -04:00
Linus Walleij 12610be33d gpio/74x164: fix clash with gpiolib namespace
The 74x164 GPIO driver has a static inline helper called
gpio_to_chip which clashes with the gpiolib namespace if we
try to expose the function with the same name from gpiolib,
and it's still confusing even if we don't do that. So rename
it to gpio_to_74x164_chip().

Reported-by: H Hartley Sweeten <hartleys@visionengravers.com>
Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2011-06-13 09:03:48 -06:00
Grant Likely c103de2404 gpio: reorganize drivers
Sort the gpio makefile and enforce the naming convention gpio-*.c for
gpio drivers.

v2: cleaned up filenames in Kconfig and comment blocks
v3: fixup use of BASIC_MMIO to GENERIC_GPIO for mxc

Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
2011-06-06 10:10:11 -06:00