Blackfin arch: Add workaround to read edge triggered GPIOs

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com> Signed-off-by: Bryan Wu <cooloney@kernel.org>
git-mirror · May 17, 2008 · 803a8d2 · 803a8d2
1 parent 92322da
commit 803a8d2
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Showing 2 changed files with 19 additions and 1 deletion.
diff --git a/arch/blackfin/kernel/bfin_gpio.c b/arch/blackfin/kernel/bfin_gpio.c
@@ -1130,6 +1130,25 @@ void bfin_gpio_irq_prepare(unsigned gpio)
 
 #else
 
+int gpio_get_value(unsigned gpio)
+{
+	unsigned long flags;
+	int ret;
+
+	if (unlikely(get_gpio_edge(gpio))) {
+		local_irq_save(flags);
+		set_gpio_edge(gpio, 0);
+		ret = get_gpio_data(gpio);
+		set_gpio_edge(gpio, 1);
+		local_irq_restore(flags);
+
+		return ret;
+	} else
+		return get_gpio_data(gpio);
+}
+EXPORT_SYMBOL(gpio_get_value);
+
+
 int gpio_direction_input(unsigned gpio)
 {
 	unsigned long flags;

diff --git a/include/asm-blackfin/gpio.h b/include/asm-blackfin/gpio.h
@@ -437,7 +437,6 @@ void gpio_set_value(unsigned gpio, int arg);
 int gpio_get_value(unsigned gpio);
 
 #ifndef BF548_FAMILY
-#define gpio_get_value(gpio) 		get_gpio_data(gpio)
 #define gpio_set_value(gpio, value)	set_gpio_data(gpio, value)
 #endif