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gpio: stp-xway: Implement get callback 

Add an implementation to get the current GPIO state.

The callback is used by the leds-gpio driver for example, in case the
current LED/GPIO state should be kept during driver load.

Signed-off-by: Mathias Kresin <dev@kresin.me>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
hifive-unleashed-5.1
Mathias Kresin 2018-06-28 21:57:40 +02:00 committed by Linus Walleij
parent bac5c3b829
commit 5b9b2b5284
1 changed files with 15 additions and 0 deletions
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15
drivers/gpio/gpio-stp-xway.c
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@ -90,6 +90,20 @@ struct xway_stp {
u8 reserved; /* mask out the hw driven bits in gpio_request */
};
/**
* xway_stp_get() - gpio_chip->get - get gpios.
* @gc: Pointer to gpio_chip device structure.
* @gpio: GPIO signal number.
*
* Gets the shadow value.
*/
static int xway_stp_get(struct gpio_chip *gc, unsigned int gpio)
{
struct xway_stp *chip = gpiochip_get_data(gc);
return (xway_stp_r32(chip->virt, XWAY_STP_CPU0) & BIT(gpio));
}
/**
* xway_stp_set() - gpio_chip->set - set gpios.
* @gc: Pointer to gpio_chip device structure.
@ -215,6 +229,7 @@ static int xway_stp_probe(struct platform_device *pdev)
chip->gc.parent = &pdev->dev;
chip->gc.label = "stp-xway";
chip->gc.direction_output = xway_stp_dir_out;
chip->gc.get = xway_stp_get;
chip->gc.set = xway_stp_set;
chip->gc.request = xway_stp_request;
chip->gc.base = -1;