diff options
| author | Richard Genoud <richard.genoud@gmail.com> | 2014-05-13 22:20:42 +0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-05-28 23:44:32 +0400 |
| commit | fa3909320c00286c6b9d6ade16bc6d44f940379c (patch) | |
| tree | 0135d87214615392a1c3bf9dcba76011e96cb47f /arch/arm/mach-at91 | |
| parent | 7f40605a2661d17275a1aa245498f4a12ad9ca9a (diff) | |
| download | linux-fa3909320c00286c6b9d6ade16bc6d44f940379c.tar.xz | |
ARM: at91: gpio: implement get_direction
This is needed for gpiod_get_direction().
Otherwise, it returns -EINVAL.
Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/arm/mach-at91')
| -rw-r--r-- | arch/arm/mach-at91/gpio.c | 13 |
1 files changed, 13 insertions, 0 deletions
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) { |