[PATCH] [PATCH][GPIO] Add IRQ edge setter to gpiolib Signed-off-by:Drasko DRASKOVIC <drasko.draskovic@gmail.com>

[Drasko DRASKOVIC]

---
 Documentation/gpio.txt     |    3 ++
 drivers/gpio/gpiolib.c     |   70 ++++++++++++++++++++++++++++++++++++++++++++
 include/asm-generic/gpio.h |    5 +++
 3 files changed, 78 insertions(+), 0 deletions(-)

diff --git a/Documentation/gpio.txt b/Documentation/gpio.txt
index e08a883..8db95e1 100644
--- a/Documentation/gpio.txt
+++ b/Documentation/gpio.txt
@@ -712,6 +712,9 @@ requested using gpio_request():
 	/* change the polarity of a GPIO node in sysfs */
 	int gpio_sysfs_set_active_low(unsigned gpio, int value);

+	/* change the irq edge of a GPIO node in sysfs */
+	gpio_sysfs_set_edge(unsigned gpio, unsigned int irq_type);
+
 After a kernel driver requests a GPIO, it may only be made available in
 the sysfs interface by gpio_export().  The driver can control whether the
 signal direction may change.  This helps drivers prevent userspace code
diff --git a/drivers/gpio/gpiolib.c b/drivers/gpio/gpiolib.c
index 5d6c71e..9b07d67 100644
--- a/drivers/gpio/gpiolib.c
+++ b/drivers/gpio/gpiolib.c
@@ -820,6 +820,76 @@ EXPORT_SYMBOL_GPL(gpio_export_link);


 /**
+ * gpio_sysfs_set_edge - sets irq edge type for an exported GPIO node
+ * @gpio: gpio to set-up edge to, already exported
+ * @irq_type: irq type to be set
+ *
+ * Returns zero on success, else an error.
+ */
+int gpio_sysfs_set_edge(unsigned gpio, unsigned int irq_type)
+{
+	struct gpio_desc        *desc;
+	struct device           *dev = NULL;
+	int                     status = -EINVAL;
+	unsigned long           trigger_flags = 0;
+
+	if (!gpio_is_valid(gpio))
+		goto done;
+
+	mutex_lock(&sysfs_lock);
+
+	desc = &gpio_desc[gpio];
+
+	if (test_bit(FLAG_EXPORT, &desc->flags)) {
+		dev = class_find_device(&gpio_class, NULL, desc, match_export);
+		if (dev == NULL) {
+			status = -ENODEV;
+			goto unlock;
+		}
+	}
+
+	switch (irq_type) {
+		case IRQ_TYPE_NONE:
+			trigger_flags = 0;
+			break;
+		case IRQ_TYPE_EDGE_FALLING:
+			trigger_flags = BIT(FLAG_TRIG_FALL);
+			break;
+		case IRQ_TYPE_EDGE_RISING:
+			trigger_flags = BIT(FLAG_TRIG_RISE);
+			break;
+		case IRQ_TYPE_EDGE_BOTH:
+			trigger_flags = BIT(FLAG_TRIG_FALL) | BIT(FLAG_TRIG_RISE);
+			break;
+		case IRQ_TYPE_LEVEL_HIGH:
+			trigger_flags = 0;
+			break;
+		case IRQ_TYPE_LEVEL_LOW:
+			trigger_flags = 0;
+			break;
+		default:
+			trigger_flags = 0;
+			break;
+	}
+
+	gpio_setup_irq(desc, dev, 0);
+	status = gpio_setup_irq(desc, dev, trigger_flags);
+
+unlock:
+    mutex_unlock(&sysfs_lock);
+
+done:
+    if (status)
+        pr_debug("%s: gpio%d status %d\n", __func__, gpio, status);
+
+    return status;
+}
+EXPORT_SYMBOL_GPL(gpio_sysfs_set_edge);
+
+
+
+
+/**
  * gpio_sysfs_set_active_low - set the polarity of gpio sysfs value
  * @gpio: gpio to change
  * @value: non-zero to use active low, i.e. inverted values
diff --git a/include/asm-generic/gpio.h b/include/asm-generic/gpio.h
index a9432fc..4827de8 100644
--- a/include/asm-generic/gpio.h
+++ b/include/asm-generic/gpio.h
@@ -252,6 +252,11 @@ static inline int
gpio_sysfs_set_active_low(unsigned gpio, int value)
 	return -ENOSYS;
 }

+static inline int gpio_sysfs_set_edge(unsigned gpio, unsigned int irq_type)
+{
+	return -ENOSYS;
+}
+
 static inline void gpio_unexport(unsigned gpio)
 {
 }
-- 
1.7.6
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