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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>
This commit is contained in:
Michael Hennerich 2008-05-17 16:01:51 +08:00 committed by Bryan Wu
parent 92322da9b5
commit 803a8d2acb
2 changed files with 19 additions and 1 deletions
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19
arch/blackfin/kernel/bfin_gpio.c
View File

@ -1130,6 +1130,25 @@ void bfin_gpio_irq_prepare(unsigned gpio)
#else #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) int gpio_direction_input(unsigned gpio)
{ {
unsigned long flags; unsigned long flags;

1
include/asm-blackfin/gpio.h
View File

@ -437,7 +437,6 @@ void gpio_set_value(unsigned gpio, int arg);
int gpio_get_value(unsigned gpio); int gpio_get_value(unsigned gpio);
#ifndef BF548_FAMILY #ifndef BF548_FAMILY
#define gpio_get_value(gpio) get_gpio_data(gpio)
#define gpio_set_value(gpio, value) set_gpio_data(gpio, value) #define gpio_set_value(gpio, value) set_gpio_data(gpio, value)
#endif #endif