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authorGeert Uytterhoeven <geert+renesas@glider.be>2021-12-03 17:06:44 +0300
committerBartosz Golaszewski <brgl@bgdev.pl>2021-12-03 17:54:31 +0300
commita00128dfc8fc0cc8848d9168d6e7cfff99bd46f0 (patch)
treefa78c02a09bbe0cad0d6060a8ed434488d8eaadb /drivers/gpio
parent49fdfe66400614ee1c484057c79dd6642c535fd4 (diff)
downloadlinux-a00128dfc8fc0cc8848d9168d6e7cfff99bd46f0.tar.xz
gpio: aggregator: Add interrupt support
Currently the GPIO Aggregator does not support interrupts. This means that kernel drivers going from a GPIO to an IRQ using gpiod_to_irq(), and userspace applications using line events do not work. Add interrupt support by providing a gpio_chip.to_irq() callback, which just calls into the parent GPIO controller. Note that this does not implement full interrupt controller (irq_chip) support, so using e.g. gpio-keys with "interrupts" instead of "gpios" still does not work. Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Signed-off-by: Bartosz Golaszewski <brgl@bgdev.pl>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpio-aggregator.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/gpio/gpio-aggregator.c b/drivers/gpio/gpio-aggregator.c
index e9671d1660ef..869dc952cf45 100644
--- a/drivers/gpio/gpio-aggregator.c
+++ b/drivers/gpio/gpio-aggregator.c
@@ -371,6 +371,13 @@ static int gpio_fwd_set_config(struct gpio_chip *chip, unsigned int offset,
return gpiod_set_config(fwd->descs[offset], config);
}
+static int gpio_fwd_to_irq(struct gpio_chip *chip, unsigned int offset)
+{
+ struct gpiochip_fwd *fwd = gpiochip_get_data(chip);
+
+ return gpiod_to_irq(fwd->descs[offset]);
+}
+
/**
* gpiochip_fwd_create() - Create a new GPIO forwarder
* @dev: Parent device pointer
@@ -411,7 +418,8 @@ static struct gpiochip_fwd *gpiochip_fwd_create(struct device *dev,
for (i = 0; i < ngpios; i++) {
struct gpio_chip *parent = gpiod_to_chip(descs[i]);
- dev_dbg(dev, "%u => gpio-%d\n", i, desc_to_gpio(descs[i]));
+ dev_dbg(dev, "%u => gpio %d irq %d\n", i,
+ desc_to_gpio(descs[i]), gpiod_to_irq(descs[i]));
if (gpiod_cansleep(descs[i]))
chip->can_sleep = true;
@@ -429,6 +437,7 @@ static struct gpiochip_fwd *gpiochip_fwd_create(struct device *dev,
chip->get_multiple = gpio_fwd_get_multiple_locked;
chip->set = gpio_fwd_set;
chip->set_multiple = gpio_fwd_set_multiple_locked;
+ chip->to_irq = gpio_fwd_to_irq;
chip->base = -1;
chip->ngpio = ngpios;
fwd->descs = descs;