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gpio: htc-egpio: add .get_direction() support 

This makes is possible to read out the current direction of a
GPIO line on the HTC CPLD GPIO expander.

Suggested-by: Russell King <linux@arm.linux.org.uk>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
This commit is contained in:
Linus Walleij 2016-11-12 14:36:17 +01:00
parent c82064f26f
commit 9298539c04
1 changed files with 10 additions and 0 deletions
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10
drivers/gpio/gpio-htc-egpio.c
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@ -225,6 +225,15 @@ static int egpio_direction_output(struct gpio_chip *chip,
}
}
static int egpio_get_direction(struct gpio_chip *chip, unsigned offset)
{
struct egpio_chip *egpio;
egpio = gpiochip_get_data(chip);
return !test_bit(offset, &egpio->is_out);
}
static void egpio_write_cache(struct egpio_info *ei)
{
int i;
@ -327,6 +336,7 @@ static int __init egpio_probe(struct platform_device *pdev)
chip->set = egpio_set;
chip->direction_input = egpio_direction_input;
chip->direction_output = egpio_direction_output;
chip->get_direction = egpio_get_direction;
chip->base = pdata->chip[i].gpio_base;
chip->ngpio = pdata->chip[i].num_gpios;