When a pin is active-low, logical trigger edge should be inverted to match the same interrupt opportunity.
For example, a button pushed triggers falling edge in ACTIVE_HIGH case; in ACTIVE_LOW case, the button pushed triggers rising edge. For user space the IRQ requesting doesn't need to do any modification except to configuring GPIOHANDLE_REQUEST_ACTIVE_LOW.
For example, we want to catch the event when the button is pushed. The button on the original board drives level to be low when it is pushed, and drives level to be high when it is released.
In user space we can do:
req.handleflags = GPIOHANDLE_REQUEST_INPUT; req.eventflags = GPIOEVENT_REQUEST_FALLING_EDGE;
while (1) { read(fd, &dat, sizeof(dat)); if (dat.id == GPIOEVENT_EVENT_FALLING_EDGE) printf("button pushed\n"); }
Run the same logic on another board which the polarity of the button is inverted; it drives level to be high when pushed, and level to be low when released. For this inversion we add flag GPIOHANDLE_REQUEST_ACTIVE_LOW:
req.handleflags = GPIOHANDLE_REQUEST_INPUT | GPIOHANDLE_REQUEST_ACTIVE_LOW; req.eventflags = GPIOEVENT_REQUEST_FALLING_EDGE;
At the result, there are no any events caught when the button is pushed. By the way, button releasing will emit a "falling" event. The timing of "falling" catching is not expected.
Cc: stable@vger.kernel.org Signed-off-by: Michael Wu michael.wu@vatics.com --- Changes from v1: - Correct undeclared 'IRQ_TRIGGER_RISING' - Add an example to descibe the issue --- drivers/gpio/gpiolib.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c index e013d417a936..9c9597f929d7 100644 --- a/drivers/gpio/gpiolib.c +++ b/drivers/gpio/gpiolib.c @@ -956,9 +956,11 @@ static int lineevent_create(struct gpio_device *gdev, void __user *ip) }
if (eflags & GPIOEVENT_REQUEST_RISING_EDGE) - irqflags |= IRQF_TRIGGER_RISING; + irqflags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ? + IRQF_TRIGGER_FALLING : IRQF_TRIGGER_RISING; if (eflags & GPIOEVENT_REQUEST_FALLING_EDGE) - irqflags |= IRQF_TRIGGER_FALLING; + irqflags |= test_bit(FLAG_ACTIVE_LOW, &desc->flags) ? + IRQF_TRIGGER_RISING : IRQF_TRIGGER_FALLING; irqflags |= IRQF_ONESHOT;
INIT_KFIFO(le->events);