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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>
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1 changed files with 15 additions and 0 deletions
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@ -90,6 +90,20 @@ struct xway_stp {
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u8 reserved; /* mask out the hw driven bits in gpio_request */
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};
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/**
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* xway_stp_get() - gpio_chip->get - get gpios.
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* @gc: Pointer to gpio_chip device structure.
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* @gpio: GPIO signal number.
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*
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* Gets the shadow value.
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*/
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static int xway_stp_get(struct gpio_chip *gc, unsigned int gpio)
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{
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struct xway_stp *chip = gpiochip_get_data(gc);
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return (xway_stp_r32(chip->virt, XWAY_STP_CPU0) & BIT(gpio));
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}
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/**
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* xway_stp_set() - gpio_chip->set - set gpios.
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* @gc: Pointer to gpio_chip device structure.
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@ -215,6 +229,7 @@ static int xway_stp_probe(struct platform_device *pdev)
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chip->gc.parent = &pdev->dev;
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chip->gc.label = "stp-xway";
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chip->gc.direction_output = xway_stp_dir_out;
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chip->gc.get = xway_stp_get;
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chip->gc.set = xway_stp_set;
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chip->gc.request = xway_stp_request;
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chip->gc.base = -1;
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