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gpio: omap: implement get_direction 

This patch implements gpio_chip's get_direction() routine, that
lets other drivers get particular GPIOs direction using
struct gpio_desc.

Signed-off-by: Yegor Yefremov <yegorslists@googlemail.com>
Acked-by: Javier Martinez Canillas <javier@dowhile0.org>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Tested-by: Tony Lindgren <tony@atomide.com>
Reviewed-by: Kevin Hilman <khilman@linaro.org>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Yegor Yefremov 2014-04-24 08:57:39 +02:00 committed by Linus Walleij
parent 47a95fe716
commit 9370084e68
1 changed files with 17 additions and 0 deletions
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17
drivers/gpio/gpio-omap.c
View File

@ -26,6 +26,7 @@
#include <linux/of_device.h>
#include <linux/irqchip/chained_irq.h>
#include <linux/gpio.h>
#include <linux/bitops.h>
#include <linux/platform_data/gpio-omap.h>
#define OFF_MODE 1
@ -927,6 +928,21 @@ static inline void mpuio_init(struct gpio_bank *bank)
/*---------------------------------------------------------------------*/
static int gpio_get_direction(struct gpio_chip *chip, unsigned offset)
{
struct gpio_bank *bank;
unsigned long flags;
void __iomem *reg;
int dir;
bank = container_of(chip, struct gpio_bank, chip);
reg = bank->base + bank->regs->direction;
spin_lock_irqsave(&bank->lock, flags);
dir = !!(readl_relaxed(reg) & BIT(offset));
spin_unlock_irqrestore(&bank->lock, flags);
return dir;
}
static int gpio_input(struct gpio_chip *chip, unsigned offset)
{
struct gpio_bank *bank;
@ -1085,6 +1101,7 @@ static int omap_gpio_chip_init(struct gpio_bank *bank)
*/
bank->chip.request = omap_gpio_request;
bank->chip.free = omap_gpio_free;
bank->chip.get_direction = gpio_get_direction;
bank->chip.direction_input = gpio_input;
bank->chip.get = gpio_get;
bank->chip.direction_output = gpio_output;