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path: root/drivers/gpio/gpiolib-legacy.c
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2015-10-16gpiolib: Split GPIO flags parsing and GPIO configurationLaurent Pinchart
When requesting a GPIO through the legacy or the gpiod_* API the gpiochip request operation is first called and then the GPIO flags are parsed and the GPIO is configured. This prevents the gpiochip from rejecting the request if the flags are not supported by the device. To fix this split the parse-and-configure operation in two and parse flags before requesting the GPIO. Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2014-12-02gpio: fix deferred probe detection for legacy APIAlexandre Courbot
Commit 14e85c0e69d5 ("gpio: remove gpio_descs global array") changed gpio_to_desc()'s behavior to return NULL not only for GPIOs numbers not in the valid range, but also for all GPIOs whose controller has not been probed yet. Although this behavior is more correct (nothing hints that these GPIO numbers will be populated later), this affects gpio_request() and gpio_request_one() which call gpiod_request() with a NULL descriptor, causing it to return -EINVAL instead of the expected -EPROBE_DEFER for a non-probed GPIO. gpiod_request() is only called with a descriptor obtained from gpio_to_desc() from these two functions, so address the issue there. Other ways to obtain GPIOs rely on well-defined mappings and can thus return -EPROBE_DEFER only for relevant GPIOs, and are thus not affected by this issue. Reported-by: Geert Uytterhoeven <geert@linux-m68k.org> Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Tested-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2014-07-24gpio: remove gpio_ensure_requested()Alexandre Courbot
gpio_ensure_requested() has been introduced in Feb. 2008 by commit d2876d08d86f2 to force users of the GPIO API to explicitly request GPIOs before using them. Hopefully by now all GPIOs are correctly requested and this extra check can be omitted ; in any case the GPIO maintainers won't feel bad if machines start failing after 6 years of warnings. This patch removes that function from the dark ages. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2014-07-23gpio: move gpio_ensure_requested() into legacy C fileAlexandre Courbot
gpio_ensure_requested() only makes sense when using the integer-based GPIO API, so make sure it is called from there instead of the gpiod API which we know cannot be called with a non-requested GPIO anyway. The uses of gpio_ensure_requested() in the gpiod API were kind of out-of-place anyway, so putting them in gpio-legacy.c helps clearing the code. Actually, considering the time this ensure_requested mechanism has been around, maybe we should just turn this patch into "remove gpio_ensure_requested()" if we know for sure that no user depend on it anymore? Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2014-07-23gpio: remove gpiod_lock/unlock_as_irq()Alexandre Courbot
gpio_lock/unlock_as_irq() are working with (chip, offset) arguments and are thus not using the old integer namespace. Therefore, there is no reason to have gpiod variants of these functions working with descriptors, especially since the (chip, offset) tuple is more suitable to the users of these functions (GPIO drivers, whereas GPIO descriptors are targeted at GPIO consumers). Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2014-07-23gpio: Add support for GPIOF_ACTIVE_LOW to gpio_request_one functionsGuenter Roeck
The gpio include file and the gpio documentation declare and document GPIOF_ACTIVE_LOW as one of the flags to be passed to gpio_request_one and related functions. However, the flag is not evaluated or used. This can cause problems in at least two areas: First, the same API can be used to auto-export pins to user space. The missing support for GPIOF_ACTIVE_LOW results in unexpected behavior for such auto-exported pins. Second, the requested gpio pin can be convered for use by gpiod functions with gpio_to_desc(). While gpio API functions do not support GPIOF_ACTIVE_LOW, gpiod functions do, which again results in unexpected behavior. Check the flag in gpio_request_one and set the gpio internal flag FLAG_ACTIVE_LOW if it is set to address those problems. Signed-off-by: Guenter Roeck <linux@roeck-us.net> Reviewed-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
2014-07-09gpio: move integer GPIO support to its own fileAlexandre Courbot
The old integer GPIO interface is, in effect, a privileged user of the gpiod interface. Reflect this fact further by moving legacy GPIO support into its own source file. This makes the code clearer and will allow us to disable legacy GPIO support in the (far) future. Signed-off-by: Alexandre Courbot <acourbot@nvidia.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>