From 9370084e685666fe33e9d62707433fa112446b03 Mon Sep 17 00:00:00 2001
From: Yegor Yefremov <yegorslists@googlemail.com>
Date: Thu, 24 Apr 2014 08:57:39 +0200
Subject: [PATCH] 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>
---
drivers/gpio/gpio-omap.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c
index 8cc9e91e7e4e..47c6056fe850 100644
--- a/drivers/gpio/gpio-omap.c
+++ b/drivers/gpio/gpio-omap.c
@@ -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;
--
GitLab