- 09 Jan, 2018 1 commit
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Maciej S. Szmigiero authored
This commit adds GPIO driver for Winbond Super I/Os. Currently, only W83627UHG model (also known as Nuvoton NCT6627UD) is supported but in the future a support for other Winbond models, too, can be added to the driver. A module parameter "gpios" sets a bitmask of GPIO ports to enable (bit 0 is GPIO1, bit 1 is GPIO2, etc.). One should be careful which ports one tinkers with since some might be managed by the firmware (for functions like powering on and off, sleeping, BIOS recovery, etc.) and some of GPIO port pins are physically shared with other devices included in the Super I/O chip. Signed-off-by:
Maciej S. Szmigiero <mail@maciej.szmigiero.name> Reviewed-by:
Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by:
Linus Walleij <linus.walleij@linaro.org>
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- 08 Jan, 2018 1 commit
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Linus Walleij authored
Before it was clearly established that all GPIO properties in the device tree shall be named "foo-gpios" (with the deprecated variant "foo-gpio" for single lines) we unfortunately merged a few bindings which named the lines "gpio-foo" instead. This is most prominent in the GPIO SPI driver in Linux which names the lines "gpio-sck", "gpio-mosi" and "gpio-miso". As we want to switch the GPIO SPI driver to using descriptors, we need devm_gpiod_get() to return something reasonable when looking up these in the device tree. Put in a special #ifdef:ed kludge to do this special lookup only for the SPI case and gets compiled out if we're not enabling SPI. If we have more oddly defined legacy GPIOs like this, they can be handled in a similar manner. Reviewed-by:
Rob Herring <robh@kernel.org> Signed-off-by:
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- 05 Jan, 2018 1 commit
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Linus Walleij authored
Some GPIO lines appear named "?" in the lsgpio dump due to their requesting drivers not passing a reasonable label. Most typically this happens if a device tree node just defines gpios = <...> and not foo-gpios = <...>, the former gets named "foo" and the latter gets named "?". However the struct device passed in is always valid so let's just label the GPIO with dev_name() on the device if no proper label was passed. Cc: Reported-by: Jason Kridner <jkridner@beagleboard.org> Reported-by:
Jason Kridner <jkridner@beagleboard.org> Signed-off-by:
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- 03 Jan, 2018 1 commit
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Linus Walleij authored
As we need to add GPIO lookup tables to the OMAP platforms, we need to reference each GPIO chip with a unique label. Use the GPIO base to name each chip, "gpio-0-31", "gpio-32-63" etc. Cc: Grygorii Strashko <grygorii.strashko@ti.com> Cc: Santosh Shilimkar <ssantosh@kernel.org> Cc: Kevin Hilman <khilman@kernel.org> Cc: linux-omap@vger.kernel.org Signed-off-by:
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- 02 Jan, 2018 3 commits
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Vladimir Zapolskiy authored
The gpiod_set_transitory() function is publicly exported, and it is expected from it to be ready for usage with optional GPIOs on consumer's side. Signed-off-by:
Vladimir Zapolskiy <vz@mleia.com> Signed-off-by:
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Vladimir Zapolskiy authored
This non-functional change slightly simplifies the implementation of gpiod_to_chip() function. Signed-off-by:
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Vladimir Zapolskiy authored
The fix restores a proper validation of an input gpio desc, which might be needed to deal with optional GPIOs correctly. Fixes: 02e47980 ("gpio: Alter semantics of *raw* operations to actually be raw") Signed-off-by:
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- 28 Dec, 2017 2 commits
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Vasyl Gomonovych authored
The test should be >= ARRAY_SIZE() instead of > ARRAY_SIZE(). Signed-off-by:
Vasyl Gomonovych <gomonovych@gmail.com> Signed-off-by:
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Linus Walleij authored
This reverts commit 93ebe863. After discussion and review of the v11 patchset, a new approach was found so that this patch is not needed. Signed-off-by:
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- 21 Dec, 2017 6 commits
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Jonathan Neuschäfer authored
Signed-off-by:
Jonathan Neuschäfer <j.neuschaefer@gmx.net> Signed-off-by:
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Rasmus Villemoes authored
While we do need macros to be able to return from the "calling" function, we can still factor the checks done by the VALIDATE_DESC* macros into a real helper function. This reduces the backslashtitis, avoids duplicating the logic in the two macros and saves about 1K of generated code: $ scripts/bloat-o-meter drivers/gpio/gpiolib.o.{0,1} add/remove: 1/0 grow/shrink: 0/15 up/down: 104/-1281 (-1177) Function old new delta validate_desc - 104 +104 gpiod_set_value 192 135 -57 gpiod_set_raw_value 125 67 -58 gpiod_direction_output 412 351 -61 gpiod_set_value_cansleep 150 70 -80 gpiod_set_raw_value_cansleep 132 52 -80 gpiod_get_raw_value 139 54 -85 gpiod_set_debounce 226 140 -86 gpiod_direction_output_raw 124 38 -86 gpiod_get_value 161 74 -87 gpiod_cansleep 126 39 -87 gpiod_get_raw_value_cansleep 130 39 -91 gpiod_get_value_cansleep 152 59 -93 gpiod_is_active_low 128 33 -95 gpiod_request 299 184 -115 gpiod_direction_input 386 266 -120 Total: Before=25460, After=24283, chg -4.62% Signed-off-by:Rasmus Villemoes <linux@rasmusvillemoes.dk> Reviewed-by:
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Joel Stanley authored
The GPIO tools build fails when using a buildroot toolchain that uses musl as it's C library: arm-broomstick-linux-musleabi-gcc -Wp,-MD,./.gpio-event-mon.o.d \ -Wp,-MT,gpio-event-mon.o -O2 -Wall -g -D_GNU_SOURCE \ -Iinclude -D"BUILD_STR(s)=#s" -c -o gpio-event-mon.o gpio-event-mon.c gpio-event-mon.c:30:6: error: unknown type name ‘u_int32_t’; did you mean ‘uint32_t’? u_int32_t handleflags, ^~~~~~~~~ uint32_t The glibc headers installed on my laptop include sys/types.h in unistd.h, but it appears that musl does not. Fixes: 97f69747 ("tools/gpio: add the gpio-event-mon tool") Cc: stable@vger.kernel.org Signed-off-by:Joel Stanley <joel@jms.id.au> Signed-off-by:
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Timur Tabi authored
pinctrl-msm only accepts an array of GPIOs from 0 to n-1, and it expects each group to support have only one pin (npins == 1). We can support "sparse" GPIO maps if we allow for some groups to have zero pins (npins == 0). These pins are "hidden" from the rest of the driver and gpiolib. Access to unavailable GPIOs is blocked via a request callback. If the requested GPIO is unavailable, -EACCES is returned, which prevents further access to that GPIO. Signed-off-by:
Timur Tabi <timur@codeaurora.org> Reviewed-by:
Stephen Boyd <sboyd@codeaurora.org> Signed-off-by:
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Timur Tabi authored
This reverts commit 72d32000. We cannot blindly query the direction of all GPIOs when the pins are first registered. The get_direction callback normally triggers a read/write to hardware, but we shouldn't be touching the hardware for an individual GPIO until after it's been properly claimed. Signed-off-by:
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Geert Uytterhoeven authored
R8A7778 is R-Car (not R-Mobile) M1. Signed-off-by:
Geert Uytterhoeven <geert+renesas@glider.be> Acked-by:
Simon Horman <horms+renesas@verge.net.au> Reviewed-by:
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- 20 Dec, 2017 8 commits
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Pravin Shedge authored
These duplicate includes have been found with scripts/checkincludes.pl but they have been removed manually to avoid removing false positives. Signed-off-by:
Pravin Shedge <pravin.shedge4linux@gmail.com> Acked-by:
Gregory Fong <gregory.0xf0@gmail.com> Signed-off-by:
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Jonathan Neuschäfer authored
u_int32_t is a non-standard version of uint32_t, that was apparently introduced by BSD. Use uint32_t from stdint.h instead. Signed-off-by:
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Christophe Leroy authored
A 'perf record' on an app continuously writing in the 'value' attribute show that most of the time is spent in kstrtol() --17.99%--value_store | |--10.17%--kstrtoint | | | |--8.82%--kstrtoll | |--2.50%--gpiod_set_value_cansleep | |--1.82%--u16_gpio_set | |--1.46%--value_store The normal case is to write 0 or 1 in the attribute, therefore this patch avoids the call to kstrtol() in the most common cases Then 'perf record' shows --7.21%--value_store | |--2.69%--u16_gpio_set | |--1.47%--value_store | |--1.08%--gpiod_set_value_cansleep | |--0.60%--mutex_lock | --0.58%--mutex_unlock Signed-off-by:Christophe Leroy <christophe.leroy@c-s.fr> Signed-off-by:
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Christophe Leroy authored
A bench with 'perf record' shows that most of time spent in value_show() is spent in sprintf() --42.41%--sysfs_kf_read | |--39.73%--dev_attr_show | | | |--38.23%--value_show | | | | | |--29.22%--sprintf | | | | | |--2.94%--gpiod_get_value_cansleep | | | value_show() only returns "0\n" or "1\n", therefore the use of sprintf() can be avoided With this patch we get the following result with 'perf record' --13.89%--sysfs_kf_read | |--10.72%--dev_attr_show | | | |--9.44%--value_show | | | | | |--4.61%--gpiod_get_value_cansleep Signed-off-by: -
Christophe Leroy authored
'value' attribute is supposed to only return 0 or 1 according to the documentation. With today's implementation, if gpiod_get_value_cansleep() fails the printed 'value' is a negative value. This patch ensures that an error is returned on read instead. Signed-off-by:
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Christophe Leroy authored
The GPIO 'value' attribute is time critical. A small bench with 'perf record' on the app below shows that 80% of the time spent in sysfs_kf_seq_show() is spent in memset() for zeroising the buffer. |--67.48%--sysfs_kf_seq_show | | | |--54.40%--memset | | | |--11.49%--dev_attr_show | | | | | |--10.06%--value_show | | | | | | | |--4.75%--sprintf | | | | | This patch changes the attribute type to prealloc, eliminating the need to zeroise the buffer at each read. 'perf record' gives the following result. |--42.41%--sysfs_kf_read | | | |--39.73%--dev_attr_show | | | | | |--38.23%--value_show | | | | | | | |--29.22%--sprintf | | | | | Test done with the following small app: int main(int argc, char **argv) { int fd = open(argv[1], O_RDONLY); for (;;) { int buf[512]; read(fd, buf, 512); lseek(fd, 0, SEEK_SET); } exit(0); } Signed-off-by: -
Bartosz Golaszewski authored
Users often pass a pointer to a static string to gpiochip_add_data() family of functions. Avoid unnecessary memory allocations with the provided helper routine. While at it: use a ternary operator instead of an if else for brevity. Signed-off-by:
Bartosz Golaszewski <brgl@bgdev.pl> Signed-off-by:
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Bartosz Golaszewski authored
This string is never modified. Make it const. Signed-off-by:
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- 08 Dec, 2017 2 commits
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Bartosz Golaszewski authored
The return value of platform_device_register_resndata() on error is an error code converted to pointer with ERR_PTR(), not NULL. Check the return value correctly. Fixes: 8a39f597 ("gpio: mockup: rework device probing") Signed-off-by:
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Linus Walleij authored
The w1 master driver includes a complete open drain emulation reimplementation among other things. This converts the driver and all board files using it to use GPIO descriptors associated with the device to look up the GPIO wire, as well ass the optional pull-up GPIO line. When probed from the device tree, the driver will just pick descriptors and use them right off. For the two board files in the kernel, we add descriptor lookups so we do not need to keep any old platform data handling around for the GPIO lines. As the platform data is also a state container for this driver, we augment it to contain the GPIO descriptors. w1_gpio_write_bit_dir() and w1_gpio_write_bit_val() are gone since this pair was a reimplementation of open drain emulation which is now handled by gpiolib. The special "linux,open-drain" flag is a bit of mishap here: it has the same semantic as the same flags in I2C: it means that something in the platform is setting up the line as open drain behind our back. We handle this the same way as in I2C. To drive the pull-up, we need to bypass open drain emulation in gpiolib for the line, and this is done by driving it high using gpiod_set_raw_value() which has been augmented to have the semantic of overriding the open drain emulation. We also augment the documentation to reflect the way to pass GPIO descriptors from the machine. Acked-by:
Evgeniy Polyakov <zbr@ioremap.net> Signed-off-by:
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- 07 Dec, 2017 9 commits
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Linus Walleij authored
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Quentin Schulz authored
The AXP813 has only two GPIOs. GPIO0 can either be used as a GPIO, an LDO regulator or an ADC. GPIO1 can be used either as a GPIO or an LDO regulator. Moreover, the status bit of the GPIOs when in input mode is not offset by 4 unlike the AXP209. Signed-off-by:
Quentin Schulz <quentin.schulz@free-electrons.com> Acked-by:
Maxime Ripard <maxime.ripard@free-electrons.com> Acked-by:
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Quentin Schulz authored
To prepare for patches that will add support for a new PMIC that has a different GPIO adc muxing value, add an adc_mux within axp20x_pctl structure and use it. Signed-off-by:
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Quentin Schulz authored
To prepare for patches that will add support for a new PMIC that has a different GPIO input status register, add a gpio_status_offset within axp20x_pctl structure and use it. Signed-off-by:
Chen-Yu Tsai <wens@csie.org> Signed-off-by:
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Quentin Schulz authored
This driver used to do only GPIO features of the GPIOs in X-Powers AXP20X. Now that we have migrated everything to the pinctrl subsystem and added pinctrl features, rename everything related to pinctrl from gpio to pctl to ease the understanding of differences between GPIO and pinctrl features. Signed-off-by:
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Quentin Schulz authored
The X-Powers AXP209 has 3 GPIOs. GPIO0/1 can each act either as a GPIO, an ADC or a LDO regulator. GPIO2 can only act as a GPIO. This adds the pinctrl features to the driver so GPIO0/1 can be used as ADC or LDO regulator. Signed-off-by:
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Quentin Schulz authored
The X-Powers AXP209 has 3 GPIOs. GPIO0/1 can each act either as a GPIO, an ADC or a LDO regulator. GPIO2 can only act as a GPIO. This adds the pinctrl features to the driver so GPIO0/1 can be used as ADC or LDO regulator. Signed-off-by:
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Quentin Schulz authored
To prepare the driver for the upcoming pinctrl features, move the GPIO driver AXP209 from GPIO to pinctrl subsystem. Signed-off-by:
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Quentin Schulz authored
Checkpatch complains with the following message: WARNING: Prefer 'unsigned int' to bare use of 'unsigned' Let's make it happy by switching over to unsigned int. Signed-off-by:
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- 02 Dec, 2017 6 commits
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Arvind Yadav authored
The platform_get_irq() function returns negative if an error occurs. zero or positive number on success. platform_get_irq() error checking for zero is not correct. Signed-off-by:
Arvind Yadav <arvind.yadav.cs@gmail.com> Signed-off-by:
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Andrew Jeffery authored
Use the new pinconf parameter for state persistence to expose the associated capability of the Aspeed GPIO controller. Signed-off-by:
Andrew Jeffery <andrew@aj.id.au> Reviewed-by:
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Andrew Jeffery authored
General support for state persistence is added to gpiolib with the introduction of a new pinconf parameter to propagate the request to hardware. The existing persistence support for sleep is adapted to include hardware support if the GPIO driver provides it. Persistence continues to be enabled by default; in-kernel consumers can opt out, but userspace (currently) does not have a choice. The *_SLEEP_MAY_LOSE_VALUE and *_SLEEP_MAINTAIN_VALUE symbols are renamed, dropping the SLEEP prefix to reflect that the concept is no longer sleep-specific. I feel that renaming to just *_MAY_LOSE_VALUE could initially be misinterpreted, so I've further changed the symbols to *_TRANSITORY and *_PERSISTENT to address this. The sysfs interface is modified only to keep consistency with the chardev interface in enforcing persistence for userspace exports. Signed-off-by:
Charles Keepax <ckeepax@opensource.cirrus.com> Acked-by:
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Colin Ian King authored
Don't populate the read-only arrays edge_det_values, rise_values and fall_values on the stack but instead make them static and constify them. Makes the object code smaller by over 240 bytes: Before: text data bss dec hex filename 9525 2520 192 12237 2fcd drivers/gpio/gpio-stmpe.o After: text data bss dec hex filename 9025 2776 192 11993 2ed9 drivers/gpio/gpio-stmpe.o (gcc version 7.2.0 x86_64) Signed-off-by:
Colin Ian King <colin.king@canonical.com> Signed-off-by:
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Adam Borowski authored
It had twice-encoded Unicode. Signed-off-by:
Adam Borowski <kilobyte@angband.pl> Signed-off-by:
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Bartosz Golaszewski authored
The user space libgpiod project is now tightly coupled with the gpio-mockup module, so let me know when any changes to it are being proposed. Signed-off-by:
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