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authorLinus Walleij <linus.walleij@linaro.org>2014-03-28 20:42:01 +0100
committerLinus Walleij <linus.walleij@linaro.org>2014-03-28 20:42:01 +0100
commitc3626fdea044cc97bfc035ebb048f7619acb6736 (patch)
tree4616758a56f3b3cef5303e511d2087d2e5eadfec /drivers/gpio
parent2ddf6cd67cc561e40454d60126a8a7cb32f3328f (diff)
downloadlinux-c3626fdea044cc97bfc035ebb048f7619acb6736.tar.bz2
gpio: unmap gpio irqs properly
When using the irqchip helper inside the gpiolib, make sure the IRQs are unmapped/disposed before the irqdomain is removed as part of removing the gpiochip. Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/gpio')
-rw-r--r--drivers/gpio/gpiolib.c33
1 files changed, 29 insertions, 4 deletions
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index f41cb4f3d715..761013f8b82f 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1399,8 +1399,18 @@ static int gpiochip_irq_map(struct irq_domain *d, unsigned int irq,
return 0;
}
+static void gpiochip_irq_unmap(struct irq_domain *d, unsigned int irq)
+{
+#ifdef CONFIG_ARM
+ set_irq_flags(irq, 0);
+#endif
+ irq_set_chip_and_handler(irq, NULL, NULL);
+ irq_set_chip_data(irq, NULL);
+}
+
static const struct irq_domain_ops gpiochip_domain_ops = {
.map = gpiochip_irq_map,
+ .unmap = gpiochip_irq_unmap,
/* Virtually all GPIO irqchips are twocell:ed */
.xlate = irq_domain_xlate_twocell,
};
@@ -1438,8 +1448,14 @@ static int gpiochip_to_irq(struct gpio_chip *chip, unsigned offset)
*/
static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip)
{
- if (gpiochip->irqdomain)
+ unsigned int offset;
+
+ /* Remove all IRQ mappings and delete the domain */
+ if (gpiochip->irqdomain) {
+ for (offset = 0; offset < gpiochip->ngpio; offset++)
+ irq_dispose_mapping(gpiochip->irq_base + offset);
irq_domain_remove(gpiochip->irqdomain);
+ }
if (gpiochip->irqchip) {
gpiochip->irqchip->irq_request_resources = NULL;
@@ -1467,7 +1483,8 @@ static void gpiochip_irqchip_remove(struct gpio_chip *gpiochip)
* translation. The gpiochip will need to be initialized and registered
* before calling this function.
*
- * This function will handle two cell:ed simple IRQs. Everything else
+ * This function will handle two cell:ed simple IRQs and assumes all
+ * the pins on the gpiochip can generate a unique IRQ. Everything else
* need to be open coded.
*/
int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
@@ -1478,6 +1495,7 @@ int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
{
struct device_node *of_node;
unsigned int offset;
+ unsigned irq_base = 0;
if (!gpiochip || !irqchip)
return -EINVAL;
@@ -1514,8 +1532,15 @@ int gpiochip_irqchip_add(struct gpio_chip *gpiochip,
* any gpiochip calls. If the first_irq was zero, this is
* necessary to allocate descriptors for all IRQs.
*/
- for (offset = 0; offset < gpiochip->ngpio; offset++)
- irq_create_mapping(gpiochip->irqdomain, offset);
+ for (offset = 0; offset < gpiochip->ngpio; offset++) {
+ irq_base = irq_create_mapping(gpiochip->irqdomain, offset);
+ if (offset == 0)
+ /*
+ * Store the base into the gpiochip to be used when
+ * unmapping the irqs.
+ */
+ gpiochip->irq_base = irq_base;
+ }
return 0;
}