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ARM: at91: gpio: implement get_direction

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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>
This commit is contained in:
Richard Genoud 2014-05-13 20:20:42 +02:00 committed by Greg Kroah-Hartman
parent 7f40605a26
commit fa3909320c
1 changed files with 13 additions and 0 deletions
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13
arch/arm/mach-at91/gpio.c
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@ -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_dbg_show(struct seq_file *s, struct gpio_chip *chip);
static void at91_gpiolib_set(struct gpio_chip *chip, unsigned offset, int val); 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(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, static int at91_gpiolib_direction_output(struct gpio_chip *chip,
unsigned offset, int val); unsigned offset, int val);
static int at91_gpiolib_direction_input(struct gpio_chip *chip, 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 = { \ .chip = { \
.label = name, \ .label = name, \
.request = at91_gpiolib_request, \ .request = at91_gpiolib_request, \
.get_direction = at91_gpiolib_get_direction, \
.direction_input = at91_gpiolib_direction_input, \ .direction_input = at91_gpiolib_direction_input, \
.direction_output = at91_gpiolib_direction_output, \ .direction_output = at91_gpiolib_direction_output, \
.get = at91_gpiolib_get, \ .get = at91_gpiolib_get, \
@ -799,6 +801,17 @@ static int at91_gpiolib_request(struct gpio_chip *chip, unsigned offset)
return 0; 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, static int at91_gpiolib_direction_input(struct gpio_chip *chip,
unsigned offset) unsigned offset)
{ {