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authorTomasz Figa <t.figa@samsung.com>2012-10-11 10:11:20 +0200
committerLinus Walleij <linus.walleij@linaro.org>2012-10-15 09:10:12 +0200
commita19fe2d45cc550ca42a3b0be3e716a8452e4b0c6 (patch)
tree61a08c16723f3cab0deeb89ff3ab753513916bb9 /drivers/pinctrl/pinctrl-samsung.c
parent22b9ba033bb4401e4cceb69c9e1af74a4631dd74 (diff)
downloadlinux-a19fe2d45cc550ca42a3b0be3e716a8452e4b0c6.tar.bz2
pinctrl: samsung: Add GPIO to IRQ translation
Some drivers require a way to translate GPIO pins to their IRQ numbers. This patch adds the .to_irq() gpiolib callback to pinctrl-samsung driver, which creates (if not present yet) and returns an IRQ mapping for given GPIO pin. Signed-off-by: Tomasz Figa <t.figa@samsung.com> Reviewed-by: Kyungmin Park <kyungmin.park@samsung.com> Acked-by: Thomas Abraham <thomas.abraham@linaro.org> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Diffstat (limited to 'drivers/pinctrl/pinctrl-samsung.c')
-rw-r--r--drivers/pinctrl/pinctrl-samsung.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/drivers/pinctrl/pinctrl-samsung.c b/drivers/pinctrl/pinctrl-samsung.c
index 0a38368edcd3..0db88bbbb2bb 100644
--- a/drivers/pinctrl/pinctrl-samsung.c
+++ b/drivers/pinctrl/pinctrl-samsung.c
@@ -26,6 +26,7 @@
#include <linux/slab.h>
#include <linux/err.h>
#include <linux/gpio.h>
+#include <linux/irqdomain.h>
#include "core.h"
#include "pinctrl-samsung.h"
@@ -528,6 +529,23 @@ static int samsung_gpio_direction_output(struct gpio_chip *gc, unsigned offset,
}
/*
+ * gpiolib gpio_to_irq callback function. Creates a mapping between a GPIO pin
+ * and a virtual IRQ, if not already present.
+ */
+static int samsung_gpio_to_irq(struct gpio_chip *gc, unsigned offset)
+{
+ struct samsung_pin_bank *bank = gc_to_pin_bank(gc);
+ unsigned int virq;
+
+ if (!bank->irq_domain)
+ return -ENXIO;
+
+ virq = irq_create_mapping(bank->irq_domain, offset);
+
+ return (virq) ? : -ENXIO;
+}
+
+/*
* Parse the pin names listed in the 'samsung,pins' property and convert it
* into a list of gpio numbers are create a pin group from it.
*/
@@ -755,6 +773,7 @@ static const struct gpio_chip samsung_gpiolib_chip = {
.get = samsung_gpio_get,
.direction_input = samsung_gpio_direction_input,
.direction_output = samsung_gpio_direction_output,
+ .to_irq = samsung_gpio_to_irq,
.owner = THIS_MODULE,
};