Hans Verkuil 4e9439ddac gpiolib: add flag to indicate if the irq is disabled ... GPIO drivers call gpiochip_(un)lock_as_irq whenever they want to use a gpio as an interrupt. This is done when the irq is requested and it marks the gpio as in use by an interrupt. This is problematic for cases where a gpio pin is used as an interrupt pin, then, after the irq is disabled, is used as a regular gpio pin. Currently it is not possible to do this other than by first freeing the interrupt so gpiochip_unlock_as_irq is called, since an attempt to switch the gpio direction for output will fail since gpiolib believes that the gpio is in use for an interrupt and it does not know that it the irq is actually disabled. There are currently two drivers that would like to be able to do this: the tda998x_drv.c driver where a regular gpio pin needs to be temporarily reconfigured as an interrupt pin during CEC calibration, and the cec-gpio driver where you want to configure the gpio pin as an interrupt while waiting for traffic over the CEC bus, or as a regular pin when receiving or transmitting a CEC message. The solution is to add a new flag that is set when the irq is enabled, and have gpiod_direction_output check for that flag. We also add functions that drivers that do not use GPIOLIB_IRQCHIP can call when they enable/disable the irq. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>		2018-09-10 08:56:11 +02:00
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aspeed.h	gpio: aspeed: Add interfaces for co-processor to grab GPIOs	2018-07-02 16:10:15 +02:00
consumer.h	gpiolib: Use GPIOD_OUT_{LOW,HIGH} macros in open drain ones	2018-07-30 00:06:33 +02:00
driver.h	gpiolib: add flag to indicate if the irq is disabled	2018-09-10 08:56:11 +02:00
gpio-reg.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
machine.h	gpiolib: add hogs support for machine code	2018-05-16 14:35:24 +02:00