diff options
| author | Yegor Yefremov <yegorslists@googlemail.com> | 2014-04-24 06:57:39 (GMT) |
|---|---|---|
| committer | Linus Walleij <linus.walleij@linaro.org> | 2014-04-28 19:35:10 (GMT) |
| commit | 9370084e685666fe33e9d62707433fa112446b03 (patch) | |
| tree | c927d2b8c41430de73de5f013320189424236910 /drivers/gpio | |
| parent | 47a95fe71662fa38ff3abe9956f1ca1451fa6e70 (diff) | |
| download | linux-9370084e685666fe33e9d62707433fa112446b03.tar.xz | |
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>
Diffstat (limited to 'drivers/gpio')
| -rw-r--r-- | drivers/gpio/gpio-omap.c | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/drivers/gpio/gpio-omap.c b/drivers/gpio/gpio-omap.c index 8cc9e91..47c6056 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; |