- 20 Dec, 2017 5 commits
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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 <christophe.leroy@c-s.fr> Signed-off-by:
Linus Walleij <linus.walleij@linaro.org>
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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:
Rob Herring <robh@kernel.org> 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 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 24 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:
Joel Stanley <joel@jms.id.au> Signed-off-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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Bartosz Golaszewski authored
In order to avoid repeating the calculations on every access - add helpers for gpio base and ngpio components of the ranges array. Signed-off-by:
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Bartosz Golaszewski authored
This variable holds the number of mockup GPIO ranges so rename it accordingly. Signed-off-by:
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Bartosz Golaszewski authored
As discussed with Marc Zyngier: irq_sim_init() and its devres variant should return the base of the allocated interrupt range on success rather than 0. This will be modified later - first, change the way users handle the return value of these routines. Signed-off-by:
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Bartosz Golaszewski authored
Implement the set_multiple() callback and register it with the gpiolib framework. This is only meant to also test the internal kernel API. Signed-off-by:
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Bartosz Golaszewski authored
Minor readability tweak: prefer breaking the lines in a way where the second part is longer than the first. Signed-off-by:
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Bartosz Golaszewski authored
Improve the module params sanitization: bail out from init if the user tries to pass a non-positive number of GPIO lines for any mockup chip. Signed-off-by:
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Bartosz Golaszewski authored
The debugfs routines returning pointers can return NULL or error codes embedded with ERR_PTR(). Check the return values with IS_ERR_OR_NULL(). While we're at it: make the error message more specific so it's not confused with the one emitted when the top-level gpio-mockup debugfs directory creation fails. Signed-off-by:
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Bartosz Golaszewski authored
Keep GPIO chip callbacks, event trigger callbacks and mockup chip setup code visibly separated. We're mostly good - just need to move the line naming routine below. Signed-off-by:
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Bartosz Golaszewski authored
GPIO values are universally represented as integers. Change the type of the variable storing the current line value to int for consistency. Signed-off-by:
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Bartosz Golaszewski authored
Currently each chip has a dedicated directory in debugfs for event triggers. We use the chip's label for the directory name, but the user can't really associate these directories with chip names without parsing the relevant sysfs entries. Use chip names for directory names. For backward compatibility: create links pointing to the actual directories named using the chip labels. Signed-off-by:
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Bartosz Golaszewski authored
Move the last bits of code dealing with module parameters to the init function. Add a new variable to platform data, which indicates to the probe function if it should name the GPIO lines. If we ever want to make the line naming more fine-grained (e.g. per chip switch) it will be easier this way. Signed-off-by:
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Bartosz Golaszewski authored
Now that the probe() function only does what is should, there's no need to split the chip adding logic into a separate routine. Merge gpio_mockup_add() into gpio_mockup_probe(). Signed-off-by:
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Bartosz Golaszewski authored
Minor coding style fix. Signed-off-by:
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Bartosz Golaszewski authored
Visually shrink the pr_err() calls by encapsulating adding the module name prefix to the message in a macro. Signed-off-by:
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Bartosz Golaszewski authored
We currently create a single platform device in init and then parse the configuration passed to us via module parameters in probe() before creating GPIO chips and registering them with the gpiolib framework. The relation between platform devices and mockup chips should be 1:1. Create a separate platform device for each mockup chip using convenient helpers (platform_device_register_resndata()). Pass a platform data structure to probe() in which the configuration (GPIO base, number of lines, chip index) extracted from the module params is stored. Make probe() create a single mockup chip for every platform device. This approach has several advantages: - we only parse the module parameters in init() and can bail out before attaching any device if the input is invalid (currently we would have to examine kernel logs), - we'll get notified by the device framework about errors in probe() for specific chips, - probe() gets simplified and only does what it's supposed to. Signed-off-by:
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Bartosz Golaszewski authored
The number of supported mockup chips is limited. Check this limit when parsing the module parameters. Also: make sure that each chip is described with a <base - ngpio> pair. Signed-off-by:
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Bartosz Golaszewski authored
If the module parameters are invalid, we should bail out from the init function instead of detecting it during the device probe. That way we don't even allow the user to load the module if we don't accept the arguments. Signed-off-by:
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Bartosz Golaszewski authored
Add the gpio_mockup_ prefix to the remaining symbols that still don't have it, so that the entire driver code is consistent. Signed-off-by:
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