Commit fa390932 authored by Richard Genoud's avatar Richard Genoud Committed by Greg Kroah-Hartman
Browse files

ARM: at91: gpio: implement get_direction 



This is needed for gpiod_get_direction().
Otherwise, it returns -EINVAL.

Signed-off-by: default avatarRichard Genoud <richard.genoud@gmail.com>
Acked-by: default avatarLinus Walleij <linus.walleij@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 7f40605a

arch/arm/mach-at91/gpio.c

+13 −0
Original line number Diff line number Diff line
@@ -49,6 +49,7 @@ static int at91_gpiolib_request(struct gpio_chip *chip, unsigned offset); 
static void at91_gpiolib_dbg_show(struct seq_file *s, struct gpio_chip *chip);

static void at91_gpiolib_set(struct gpio_chip *chip, unsigned offset, int val);

static int at91_gpiolib_get(struct gpio_chip *chip, unsigned offset);

static int at91_gpiolib_get_direction(struct gpio_chip *chip, unsigned offset);

static int at91_gpiolib_direction_output(struct gpio_chip *chip,

					 unsigned offset, int val);

static int at91_gpiolib_direction_input(struct gpio_chip *chip,
@@ -60,6 +61,7 @@ static int at91_gpiolib_to_irq(struct gpio_chip *chip, unsigned offset); 
		.chip = {						\

			.label		  = name,			\

			.request	  = at91_gpiolib_request,	\

			.get_direction    = at91_gpiolib_get_direction, \

			.direction_input  = at91_gpiolib_direction_input, \

			.direction_output = at91_gpiolib_direction_output, \

			.get		  = at91_gpiolib_get,		\
@@ -799,6 +801,17 @@ static int at91_gpiolib_request(struct gpio_chip *chip, unsigned offset) 
	return 0;

}



static int at91_gpiolib_get_direction(struct gpio_chip *chip, unsigned offset)

{

	struct at91_gpio_chip *at91_gpio = to_at91_gpio_chip(chip);

	void __iomem *pio = at91_gpio->regbase;

	unsigned mask = 1 << offset;

	u32 osr;



	osr = __raw_readl(pio + PIO_OSR);

	return !(osr & mask);

}



static int at91_gpiolib_direction_input(struct gpio_chip *chip,

					unsigned offset)

{

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