From: Richard Genoud Date: Tue, 13 May 2014 18:20:42 +0000 (+0200) Subject: ARM: at91: gpio: implement get_direction X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=fa3909320c00286c6b9d6ade16bc6d44f940379c;p=deliverable%2Flinux.git ARM: at91: gpio: implement get_direction This is needed for gpiod_get_direction(). Otherwise, it returns -EINVAL. Signed-off-by: Richard Genoud Acked-by: Linus Walleij Signed-off-by: Greg Kroah-Hartman --- diff --git a/arch/arm/mach-at91/gpio.c b/arch/arm/mach-at91/gpio.c index a5afcf76550e..afbe34027e62 100644 --- a/arch/arm/mach-at91/gpio.c +++ b/arch/arm/mach-at91/gpio.c @@ -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) {