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Date: Fri, 5 Jun 2009 11:51:05 -0700
From: H Hartley Sweeten <hartleys@...ionengravers.com>
To: Linux Kernel <linux-kernel@...r.kernel.org>
Cc: David Brownell <dbrownell@...rs.sourceforge.net>
Subject: [PATCH] gpiolib: add gpio_request/free_irq
Add support functions to gpiolib to request/free gpio irqs.
Signed-off-by: H Hartley Sweeten <hsweeten@...ionengravers.com>
Cc: David Brownell <dbrownell@...rs.sourceforge.net>
---
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 51a8d41..5b4b864 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -1103,6 +1103,52 @@ int __gpio_to_irq(unsigned gpio)
}
EXPORT_SYMBOL_GPL(__gpio_to_irq);
+/**
+ * gpio_request_irq() - allocate a gpio interrupt line
+ * @gpio: gpio whose IRQ will be allocated
+ * @handler: function to be called when the IRQ occurs
+ * @irqflags: interrupt type flags
+ * @label: an ascii name for the claiming device
+ * @data: a cookie passed back to the handling function
+ */
+int gpio_request_irq(unsigned gpio, irq_handler_t handler,
+ unsigned long irqflags, const char *label, void *data)
+{
+ int err;
+
+ err = gpio_request(gpio, label);
+ if (err)
+ goto fail;
+
+ err = gpio_direction_input(gpio);
+ if (err)
+ goto free;
+
+ err = request_irq(gpio_to_irq(gpio), handler, irqflags, label, data);
+ if (err)
+ goto free;
+
+ return 0;
+
+free:
+ gpio_free(gpio);
+fail:
+ return err;
+}
+EXPORT_SYMBOL_GPL(gpio_request_irq);
+
+/**
+ * gpio_free_irq() - free an interrupt allocated with gpio_request_irq
+ * @irq: gpio interrupt line to free
+ * @data: device identity to free
+ */
+void gpio_free_irq(unsigned int irq, void *data)
+{
+ free_irq(irq, data);
+ gpio_free(irq_to_gpio(irq));
+}
+EXPORT_SYMBOL_GPL(gpio_free_irq);
+
/* There's no value in making it easy to inline GPIO calls that may sleep.
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index d6c379d..c0ab7cf 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -3,6 +3,7 @@
#include <linux/types.h>
#include <linux/errno.h>
+#include <linux/interrupt.h>
#ifdef CONFIG_GPIOLIB
@@ -134,6 +135,11 @@ extern int __gpio_cansleep(unsigned gpio);
extern int __gpio_to_irq(unsigned gpio);
+/* request/free gpio interrupt */
+extern int gpio_request_irq(unsigned gpio, irq_handler_t handler,
+ unsigned long irqflags, const char *label, void *data);
+extern void gpio_free_irq(unsigned int irq, void *data);
+
#ifdef CONFIG_GPIO_SYSFS
/*
diff --git a/include/linux/gpio.h b/include/linux/gpio.h
index e10c49a..eaf7b27 100644
--- a/include/linux/gpio.h
+++ b/include/linux/gpio.h
@@ -109,6 +109,18 @@ static inline int irq_to_gpio(unsigned irq)
return -EINVAL;
}
+static inline int gpio_request_irq(unsigned gpio, irq_handler_t handler,
+ unsigned long irqflags, const char *label, void *data)
+{
+ return -ENOSYS;
+}
+
+static inline void gpio_free_irq(unsigned int irq, void *data)
+{
+ /* GPIO irq can never have been requested */
+ WARN_ON(1);
+}
+
#endif
#endif /* __LINUX_GPIO_H */
--
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