gpio: pca953x: Add wake-up support

Implement the irq_set_wake() method in the (optional) irq_chip of the
GPIO expander, and propagate wake-up settings to the upstream interrupt
controller.  This allows GPIOs connected to a PCA953X GPIO expander to
serve as wake-up sources.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>

1 files changed, 9 insertions, 0 deletions

diff --git a/drivers/gpio/gpio-pca953x.c b/drivers/gpio/gpio-pca953x.c
index cf50d7dbf6ff..caf7dd1d5e16 100644
--- a/drivers/gpio/gpio-pca953x.c
+++ b/drivers/gpio/gpio-pca953x.c
@@ -576,6 +576,14 @@ static void pca953x_irq_unmask(struct irq_data *d)
         chip->irq_mask[d->hwirq / BANK_SZ] |= 1 << (d->hwirq % BANK_SZ);
 }
 
+static int pca953x_irq_set_wake(struct irq_data *d, unsigned int on)
+{
+        struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
+        struct pca953x_chip *chip = gpiochip_get_data(gc);
+
+        return irq_set_irq_wake(chip->client->irq, on);
+}
+
 static void pca953x_irq_bus_lock(struct irq_data *d)
 {
         struct gpio_chip *gc = irq_data_get_irq_chip_data(d);
@@ -795,6 +803,7 @@ static int pca953x_irq_setup(struct pca953x_chip *chip,
         irq_chip->name = dev_name(&chip->client->dev);
         irq_chip->irq_mask = pca953x_irq_mask;
         irq_chip->irq_unmask = pca953x_irq_unmask;
+        irq_chip->irq_set_wake = pca953x_irq_set_wake;
         irq_chip->irq_bus_lock = pca953x_irq_bus_lock;
         irq_chip->irq_bus_sync_unlock = pca953x_irq_bus_sync_unlock;
         irq_chip->irq_set_type = pca953x_irq_set_type;